Whilst I agree real sex is obviously better, By definition ones still an incel if the only sex they get is from escorts. Non-escort sex is better, plain and simple. If a guy only has sex with escorts, he's still an incel by the definition of the word.
So it really depends, are guys going to escorts out of convenience (not incels), or because it's the only way they can get any at all (incels).
A guy who dabbles in the virtual stuff but still has sex with women for free isn't an incel. A guy who avoids the virtual stuff but only has sex with escorts is an incel.
I get thats a bit off topic haha.
There's also the fact that online stuff is way cheaper than paying for escorts. Personally, I'm not into the virtual stuff at all, the real things way better, and if I'm gonna watch porn, it's gonna be the free and basic kind.