We can't take any video at face value anymore unfortunately - a video can be edited to make things look differently, or simply captured in a way to hide some elements out of the picture. It's been used by media before to push a specific narrative.
Not really sure what else to say, even if he had done something to provoke a response aside from shouting(you can read the multiple articles for details) he wasn't resisting arrest, was stationary and the federal agent broke his hand in two places[1].
I can't think of any situation where beating the shit out of someone who's standing still and not reacting is an appropriate response. Much less from someone who is expected to uphold the law and supposedly trained to deal with stressful situations.
[1] https://twitter.com/Tazerface16/status/1284849286237151232
federal agent broke his hand in two places