The Heritage Foundation has been around since the 70's. There are hundreds of similar think tanks across all political stripes that come up with "projects". They all have people affiliated with political parties.
The Dems have just been pushing this narrative as a means to demonize the Rep's again.
https://en.wikipedia.org/wiki/List_of_think_tanks_in_the_United_States
What is Project 2025? Wish list for a Trump presidency, explained
A think-tank with ties to Trump has set out a vision for Republicans. But the former president has tried to distance himself from it.
www.bbc.com
Trump would be best to distance himself as far away from this as possible.