Malmsteen has no issues playing 8's.. he also tunes to Eb so his strat sounds more EVIL.. lol, actually YJM doesn't sound right in standard tuning.
Interesting that they are using modelers too.. this stuff is getting better and better. I too would worry about the chemistry though. How is that supposed to work? King sings a part and then they send back some rythms? It might also be for ease of setup if they fly him in for a week and they all record in a small studio. No need to set up mics and risk not wanting to touch them etc.. I'd suspect this will become the norm because you can work with multiple clients at once vs the old days of renting out a studio for 2-3 weeks exclusively for your band.
In a separate thought, Overloud seems to be bringing the goods on the modelling as well these days. I have always thought there stuff sounds good " for a modeler" but now it seems as if everyone has upped their game in the last 2 or so years.