To me, on first listen, this is clearly 4/4.
Here is some justification:
There is a snare on every 3, which screams "4/4 halftime backbeat". This is an extremely common pattern in Jazz, Funk, Metal, Rock, Pop, Dance, etc. etc... Most experienced listeners of any of these genres will recognize as a STRONG signal for 4/4, so you need good reason to say it's not.
The main reason to suggest a different time signature is to place the accents on downbeats. It's not necessary that downbeats are accented, though, and this song clearly takes from the funk genre, where it's perfectly normal to accent any beat, downbeat or not.
Also, Apply Occam's razor- The simplest explanation is probably correct. "It continues in 4/4" is a convincing and very simple explanation. Changing time signatures is atypical for the genre, and much more complicated of an explanation, and now the snare is playing... anything but a normal backbeat.
It is not polyrhythmic either. The kick and snare pattern repeat in groups of 8 beats. Well, not quite exactly, but the general idea is there. The first 8 beats are the same as the next 8 beats, which are almost the same as the next 8 beats (a couple kicks get added, but the original pattern is still there). The last 8 beats are different to lead into the next phrase, but these are clearly 4/4 anyway. So, whatever time signatures we use, they should probably reflect this and repeat in groups of 8. 4/4 all the way through does this quite simply. Compare the kick and snare pattern to a halftime version of this common groove.