How did @Sweden make the blocklist that listed Pewdiepie & the Israeli Foreign Ministry as "Nazis" ?

We reported earlier about the @Sweden Twitter account which claimed to protect freedom of speech by blocking 14,400 people from interacting with it. You can search for your twitter handle at the bottom of this article and see if you were blocklisted by @Sweden.
While some people were rather amused by the block, Pewdiepie made a video pretending to cry over it, others were not. Jan Ericson, a member of parliament for Moderaterna (conservatives) demanded to know why he was on that list. In email correspondence with to the Sweden Institute, and their General Director Annika Rembe, he demanded to know why he was on the list, how the list was created, and he wanted a copy of the list itself. The list was swiftly deleted and everyone was unblocked, but this did not quell Jan Ericsson's thirst for knowledge.

However, as far as the list is concerned, it is, of course, unacceptable to delete a list after it has been requested in accordance with the public act. However, you have decided to "wipe out" the list by a decision made by your General Director, while showing that you have had the list in your possession. This makes my questions to the General Director extremely relevant.
As for text on SI.se, point three is added as late as Sunday evening or Monday morning. Before that, there was only point 1-2. Hence, my question remains what made you think that a block of me according to the current list could be "quality assured" as you claimed on your part. If it's as you write in your mail that you "can not specify the reason for each block," how could you at the same time claim your side that blockages are "quality assured"?
I receive written answers to all my questions in my original mail to the Director General.
To this end, I would like to add another two questions.
• How did your alleged "quality assurance" of the list go?
• Who did the review required to "quality assure" the blockages?

So why did people like Pewdiepie end up on the list? According to an article "When hatred becomes a game" written by Vian Tahir in the publication Fria.nu, he is supported by Nazis. In the article she also summarizes Gamergate, claiming it made a game out of harassing women. Pewdiepie doesn't realise that he's feeding this alt-right /pol/ beast, she says.

The latest example of this, the Swedish Youtube blogger Pewdiepie with millions of followers, shows it clearly. Felix Kjellberg, as he really called, was criticised for a series of controversial "joke" where the point of the joke was Nazism. He does not see his so-called jokes in a political context but claims that humour is that people are hypersensitive and that the media conducts a witch hunt against him. A rhetoric that feels good again from both Gamergate and racist online warriors. In the case of Pewdiepie, he has, despite the intentions of his so-called joke, been supported by neo-Nazi movements and websites.

This is why Sweden creeps me out. https://t.co/gYVQsPAOiF

— Tim Pool (@Timcast) May 16, 2017

The Israeli ambassador to Sweden seemed more bemused by the block, and tweeted happily when he was unblocked.

Hi @sweden, I WAS UNBLOCKED. Hope all is well and that you don't find me now as scary as before..

— Isaac Bachman (@isaacbachman) May 17, 2017

Destroying the blocklist used may, in fact, be illegal, and conservative Member of Parliament Jan Ericson isn't going to let this slide. In his email to Sweden Institute he states:

...Of course, I will not drop my request to get a copy of the list. It's a public act. I can not see that you have legal support to destroy this.