Pretty unlikely we'd exceed it by $20 million, let alone $40 million.
But (I think) Atown was referring to FA compensation. A normal team (neither a tax-payer nor a receiver of revenue-sharing, as the Phillies have been) loses its 2nd-round pick (technically second-highest pick) and $500K in international for signing a QO free agent. A taxpayer loses the 2nd and the 5th, and $1,000,000.
So if we go over the tax and then sign Kris Bryant or Max Scherzer or Carlos Correa, yeah, it would hurt more as a taxpayer. And this is obviously not a team that should be giving up two picks in the first five rounds. But I would cross that bridge when the off-season arrives, not make decisions this week based on that.
It's also a bit of a Catch-22, because if you don't want them to exceed the CBT this week, you are basically signing up for giving up more talent in the trades. The Cubs would probably pay all of Kimbrel's salary if you give them enough of a return, just like Boston paid Workman's to get Seabold and Pittsburgh is paying Frazier's. Maybe that's worth it if you're also looking ahead to a QO FA (i.e. you give up more now but preserve your 2nd and our 5th next year). But if you're not, probably better to pay the tax and hold on to a better group of prospects.