A former UN official, a former NATO military official, and an academic?Yet another example of the general rule that the fact of one having held at one point a high-status position does not, ipso facto, validate what one has to say about any particular topic.
As to the content -- some interesting history, albeit with a lot cherry-picking and selective omission; and apparently not a few simple misstatements or reversals of fact. The sibling commenters have done a better job of dissecting its content.
But beyond their words -- it's important to look at who these guys are, and crucially -- who they associate with, and who's buying them lunch.
As to Harald Kujat, from Wikipedia:
Since July 2016, Kujat is a member of the Supervisory Board of the Berlin-based Research Institute Dialogue of Civilizations[4] (DOC), allegedly financed by Vladimir Yakunin,[5] until 2015 CEO of the Russian Railways and by some sources considered a member of the Russian president Vladimir Putin's inner circle.
By some conservative German media (Bild-Zeitung, Die Welt) Kujat was criticized for his pro-Russian views in German TV talk shows,[6][7][8] allegedly being considered with misgiving by the German Federal Government.[9]
Yakunin is (or was at one time anyway) the President of the DoC, and he's definitely very close to Putin. As for the criticisms of the German Press -- there's an article titled
Talkshows verkaufen Propagandisten als „Experten“ you can easily which seems to get right to the point.
As for mister Hajo Funke (translated):
In February 2023 Funke was one of the first signatories of the Manifest for Peace initiated by Sahra Wagenknecht and Alice Schwarzer that calls for [essentially the same "peace" plan described in the article]
Wagenknecht (former opposition leader in the Bundestag) and Schwarzer (an activist) have both held some notably weird, authoritarian views over the years (while seeming to mostly promote good wholesome left-wing views). Wagenknecht's were considered so extreme that it led to a row within her own party (The Left), some of whom said publicly that she ought to join the far-right AfD. In any case, she's generally considered to be radioactive in Germany politics right now - such that one doesn't go around signing or otherwise publicly endorsing something she says - unless one wishes to make a very conspicuous statement.
That tells you what you need to know about these guys (2 out 3 anyway).