Getting back to the topic at hand:
Hopefully it's +2/+1, a couple skill proficiencies, and a free feat, for which the shown human chose Polearm Mastery (which also granted polearm proficiencies).
But if the last feature isn't a feat option but is Polearm Proficiency, then yes Human is the worst race choice by far.
I expect that it's like you suggest, part of the Polearm Mastery Feat which that particular player chose.
As far as I know it's still not confirmed that our humans will all get that proficiency and think we're still going off screenshots and don't know if we can amend the racial feats at all. But if so, then though I've tended to ignore those weapons in early access, it sounds like it might be worth giving them another look, especially for, eg, human clerics. Particularly as I think Polearm Master was on that list of feats in game.
Good to know that Polearm Master is on the list of feats for the game, and it makes me more confident in my theory that humans get a free feat. A level 1 feat is pretty significant in 5e, although unfortunately some feats are vastly more powerful than others (e.g., GWM and Sharpshooter) and can thus have a probably-too-large effect on level 1 characters' effectiveness.
If true, then BG3 humans will actually be strictly better than Variant Human due to the +2/+1 instead of +1/+1. As variant human is already a very commonly chosen race...I thought Larian didn't want us to play Boring Human Character™ xD
