It may be trick depending on the timing you take to jump kick your opponent. As I've already used to that combo, to me, it's become very easy to do.I find the dash,2,2 bit of that quite tricky. Either I miss the dash timing or the 2,2 often turns into a "Fist Smash" (F2).
On the few occasions I land the dash,2,2 the opponent seems to hit the floor before the x-ray hits.
The basic Ermac's bnb: B+1, 1, slam, JF+4, teleport, dash, 2, 2, push requires a lot of training but once you get it, I actually find the x-ray easier to do at the end than force push. People talk shit about Ermac, but Ermac has already a lot of disavantages, it's not like he's a full character or nearly op like Kung Lao was initially.