There's zero chance that the future Librem laptops will be "truly" open source. They will still have ME or AMD equivalent. Their entire marketing campaign is frustratingly dishonest.

They're quite competent con men. If you call them out about it (as the Coreboot developers did) especially on Reddit, they give very dismissive, yet non-committal comments

"We're in talks with Intel" "They really want to do this" "We're going to make a petition to show interest to Intel"

The reality is that even Google with their Chromebooks, despite hiring most of the Coreboot team and shipping volume into the likely millions of units, was unable to persuade Intel. Even for the absolutely tiny set of CPU models they use

Those still have the eeeeevil ME, although maybe in a semi-dormant form.