It's important to note this is not a peer-reviewed publication, this is just some document that has been shared. While the author has a doctorate in theoretical physics, and has extensive experience in that field, their Wikipedia article also has the following line:

> Hossenfelder's more recent content has received criticism for her attacks on academic research[13][14] and for conspiracy theory-style portrayals of the physics community.

(The author recently had their affiliation end with the Ludwig Maximilian University of Munich, and is not happy about it.)

I don't know remotely enough to comment on the author's statements or research, or on the contents of this document, but I would advise caution on getting too excited over significant developments that haven't yet been peer reviewed.

Relevant XKCD: https://xkcd.com/2304/