50美分派对 also finds no results on Bing, but plenty of results on Google.
So it's not just tank man. The word filter is active for all search terms that are blocked in china.
50美分的军队 I think is another way of writing it: it shows only 3 images on bing, which all look like ads for Coca Cola.
美分 means "American fen", so it would only be used to refer to American cents.
派對 is a neologism that sounds like the English word "party" and it is only used in the context of having a social gathering.
If you search 五毛黨 you will find plenty of results.
Personally I think most of what foreigners think are 五毛黨 are actually 小粉紅, which means "little pink". This is the term used to describe young nationalists who take part in internet pile-ons, similar to online "activists" we have in the west. It might be that some of them are paid, but I suspect most of them are just doing it because they enjoy feeling like they are part of an in-group.
Would it be fair to say that the English phrase "Angry Youth" (used in the same context) has the same meaning?
I quite like this article from 2019 about Wandering Earth which tries to explain two facets of the contemporary Chinese right wing, that is the 小粉紅 Little Pinks and 工業黨 Industrial Party. Or, as they choose to translate it, "Young Cyber-Nationalists" and "Prometheans". In English: https://chuangcn.org/2019/08/wandering-earth/
Edit: the wiki page you linked has it in simplified and traditional characters.
If you look closely at the Wikipedia article, you'd see that the text in the infobox is 五毛党 (五 wǔ 5, 毛 máo 0.1 piece, 党 dǎng political group [No relation to Daniel G]).
What you wrote is 50 美分 (měi fēn American cent) 派对 (pài duì fun get-together.)
I get Bing results for both, but the "American cent" ones are all about the rapper.