I've heard MacBook intel chips are AMT-capable, but AMT isn't ever enabled so you can't actually use it. Is this true?
Neither SCCM nor AMT are viable management suites for macOS. The former has some limited success doing anything, AMT flat out isn’t well documented. One recent vulnerability seems to cover chipsets Apple uses, but there’s no Apple link amongst the 30+ vendor links to patch those vulnerabilities:
I would look to one of the traditional Mac MDM solutions to manage your Macs. I would also contact intel and Apple if you have a specific serial you want to check is or is not vulnerable and get an on the record answer.
As far as pragmatic solutions to manage macs, start with a free hosted MDM like https://www.jamf.com/products/jamf-now/ and then you can evaluate if you want to pay for a hosted service as you grow or partner / build your Mac MDM solution from open source like https://www.munki.org/munki/