I find that hard to believe. In fact you are talking complete BS!
Please do not post false info unless you know what your talking about. The squish on my my stock 05 300EXC was right at about .083" or 2 mm (give or take a hair) measured with solder by me. I had the head done and have not measured the squish since (that was back in 07).
It would be doubtful that the Beta would even run with a .165" squish. FWIW less squish with proper fuel will give you a cooler running motor.
Opinions on suspension is one thing, handing out false info is just plain wrong.
I'll second that and back it up with real world experience...... My 2013 beta 300rr has .080" squish stock. I'll have to take your word for what a ktm has, I don't know.
So far as suspension goes, most will be better off with a open chamber Sachs fork than any brand of multiple chamber, complex, heavily marketed fork on the market. I am A level enduro and hare scramble and like my Sachs better than all twin chamber WP's, KYB
's, Showas, and Marzocchi's that I've had. To be fair, I have not tried the 4cs but have heard some great reviews.