Find this a bit odd. For one, it's not true. I've seen tons of positive sentiment from his critics including myself, (the "days since a Flekken f*** up" gimmick account on Twitter even changed its whole theming to a flekken fan account at half time).
Then also I find the tone ur strangely gloating, like you've known the whole time he was great and everyone else has just been blinded by bias. He was massively underperforming, objectively. Eye test and stats both said he was just not making enough saves for any but the easy shots. He's had a couple of decent performances sprinkled throughout, and last night he had an incredible performance. None of this is contradictory.
It was also my and probably many other flekken "naysayers" assumption that it was always a question of form/confidence and not quality, since we had the evidence of his Freiburg seasons to show he wasn't anywhere near his usual level, which he as much as admitted himself in that interview. So I don't think it invalidates any previous criticisms that he was brilliant last night. Long may it continue!