Misleading title: they are using eminent domain to seize land for power lines to data centers. (emphasis mine) This is still quite debatable, but so much less so than the implied accusation that they would somehow sell out their privileges as subcontractors for the data centers themselves.
There have been some pretty egregious misuses of eminent domain in the past, but using it for infrastructure is pretty much the quintessential justification. That's basically the only reason to have eminent domain at all. Arguing against it when that's how it's being used is, in my opinion, essentially arguing against the very concept of eminent domain. Which one can totally choose to do! But they should be up front…
You're giving a blank check to use it as long as it's infrastructure, and as any simple rule, it's prone to get abused way beyond it's primary goal. IMHO the issue is nuance and balance, we should accept that whether it's applicable is an "it depends" matter.
Keeping it too simple and black and white means companies can now strategically place data centers and get the local government to seize all the land leading to it, and vice versa, local govs can nudge companies to target specific places to seize wherever they want. Especially as the plans aren't required to come to fruition.