This really does point out Jax's limitations in neutral with HD variation. Basically everything is F2 mix, F33, or jump-in, which gets easy to predict and once Flawless Block use starts getting more widespread he's going to be considered much lower tier IMO.
Notice he only used Quad Grab three times in the entire set and it wasn't even fully extended any time, just did it off a D12 in the corner once for 70, then raw the other two times for 70 and 120. It's a weak ass part of his kit because it's too risky to cancel into without a guaranteed block confirm or S4 hit confirm, and hard to make either of those confirms in time online, but easy to whiff punish if you accidentally up inputting it on an incompatible hit confirm. It's barely even reasonably considered a "tick throw" at this point, on two occasions in the match he could've done literally the same thing with 1+3 throw and gotten more damage.
Yeah, but the actual output on it is... weird.
Depending on your distance and when/how many times you hit your R1 it sometimes will totally skip the first hit (the mid) and go straight to the throw, which means it can get ducked/low profiled and punished. If they do block the mid, you get pushed away too far for the throw to connect on Amp.
I'm not a big fan of it because of the inconsistency, but it's safe on block, yeah.