Are you refering to me?

If so No, that is on my maxed-out 1/3hp Single Stage which I run 24/7
Temps are pretty bad under load (CPU gets way into positive range) so yeah, I guess my chip could do 4,4 with HT on on high end water as well.
And yeah, you can run 2 instances IBT but people here are only running 1
And running LinX is way easier and more comfortable than 2x IBT, it's like back in the Dualcore days with prime vs. Orthos

Although I am sure IBT will be adapted soon enough.