I know of at least of one case in which a person publicly admits he is using Wikipedia to promote their political stances and who is right now at the center of an arbitration case in which he intends to silence opposition.
This is not that.
You are looking at a case of a person LITERALLY admitting they are using it for propaganda and your reaction is "I'm sure it's actually not, it's actually neutral and it's just that it differs from your view". I'm sorry but I can only explain it to you, I can't understand it for you.
Individuals and groups, be they ad-hoc formations, corporate backed, or nation-state backed routinely astroturf all corners of the internet and Wikipedia is a very big, very common target.