It's not just a single repertoire -- I think he may have adjusted at certain levels and maybe tried different ones in different speed runs.
But from what I recall, he was mostly playing e4 as White. At the lower levels, there were a lot of attempts at a Danish Gambit (I say attempts because almost nobody cooperated and played the main lines). I think later he moved on to the Four Knights Scotch and the Ruy Lopez. Against c5, he was playing the Alapin for a while, though I also seem to recall some where he played the Open Sicilian. I can't remember what he did against the Caro or French. Against the Scandinavian, I recall him trying a fianchetto setup.
As Black, he mostly played the Accelerated Dragon against e4, and I think the KID against d4 (and Nf3 or c4). Though I seem to recall at least one QGD as well.
I just discovered his amazing channel a week ago and has been tuning in to his videos......especially the openings speedruns. Unfortunately it will take me a month or more to grasp what openings he recommends as I can only watch one or two videos a day. I believe he finished the sensi speedruns and is now going through the top gun speedrun.....what openings did he recommend through the sensi and top gun speedruns?