Let's be precise and remove those scare quotes.
In 2015/2016 Trump was literally talking about saving U.S. critical infrastructure:
1. Promising to fulfill a trillion dollar U.S. infrastructure campaign pledge to repair crumbling infrastructure[1]
2. Putting Daniel Slane on the transition team to start the process to draft said trillion dollar infrastructure bill[2]
By 2017 that plan was tabled.
If anyone can find it, I'd love to see Slane's powerpoint and cross-reference his 50 critical projects against what ended up making it into Biden's Inflation Reduction Act.
1: https://www.youtube.com/watch?v=OafCPy7K05k
2: https://www.youtube.com/watch?v=EdvJSGc14xA
Edit: clarifications
Clearly Trump himself has no interest in these sorts of substantive projects, I mean just look at his second term. He has even less interest in policy this time around and isn't even pretending to push for infrastructure or similar legislation.
That's a fairly standard case of an ineffective politician casually jettisoning campaign promises once he's in office. And he jettisoned them because he couldn't sell the Republicans on a trillion dollar infrastructure package.