He did actually keep quite a few of his campaign promises. Where he really got stymied was lack of cooperation from the house under Ryan (early days of the dossier hoax).
I made a habit of trying to count broken campaign promises starting in the Clinton years, and it is pretty much universal that presidents over-promise during the campaign and do the opposite once they get into office. I haven't really kept accurate numbers, but it certainly wasn't unique to trump by any means.
I don't have the data, but let's just say that campaign promises are not credible, regardless of the politician. A whole lot of the promises made are outside the baliwick of the position, and should be rediculed when made, not when broken (mayoral candidates often promise to fix schools in jurisdictions where the schools are accountable to school boards and not city governments, for example. Presidential candidates promise things that would need to be enacted by the legislature. At the same time, a presidential candidate that promises to suggest legislation sounds unambitious).
But what makes me less likely to trust Trump's claims and promises is his consistent denial of claims he made previously that he no longer wishes to make. It's hard to trust someone when they change positions and deny that they had a different positon. Gives very We were always at war with Eastasia vibes.
> let's just say that campaign promises are not credible, regardless of the politician
That assertion is unlikely to be meaningful, IME. Specific politicians are more and less credible in specific ways. To say 'all are not credible' is no more true or meaningful than saying 'all are credible'. Off the top of my head: All food contains water, but that tells us almost nothing about any food.
I made a habit of trying to count broken campaign promises starting in the Clinton years, and it is pretty much universal that presidents over-promise during the campaign and do the opposite once they get into office. I haven't really kept accurate numbers, but it certainly wasn't unique to trump by any means.