I think it’s in 4/4, but the rhythm is syncopated in such a way as to really throw you off. It sets up a backbeat in the first measure, with the hit on beats 2 and 4. This continues in the second measure on beat 2, but then when beat 4 hits again, there’s nothing, and the hit is delayed to some difficult to identify subdivision of the beat that sounds really off. Then the backbeat picks right back up within the established pattern. You can clap out 4/4 and will find it sticks with it, but you have to ignore the syncopated rhythm to do so or you’re liable to mess up.

Btw, 4/4 just means each measure has 4 beats. In this case, you would count out 1, 2 (hit), 3, 4 (hit), 1, 2 (hit), 3, 4 (no hit/hesitation), and then start over