The package without Myers makes some sense, or if they pay all but $5-7M per year on Myers's contract.
No way I trade Betts and add a future (likely) deadwood contract.
The other part of the package does not do enough to offset his negative input.
The MLB trade simulator says the Padres fall short by 38 by including Luchessi & Quantril- not just one!
Basically, SD would have to give over $35M, Myers, Campusano, Luchessi, Quantril & Cronenworth to be accepted on the site. I'm not saying the site is accurate, but the offer you mention is far short of even.