https://www.bbc.com/news/business-35836623 - how Trump made his money . no mention of Rothschild

One of Trump's first projects was the attempted turnaround of the troubled Swifton Village apartment complex in Cincinnati, Ohio, which his father, Fred Trump, had purchased at foreclosure for $5.7 million in 1962, equivalent to $46 million in 2017.[5] Fred and Donald Trump became involved in the project. By the time Trump graduated from college in 1968, he was receiving the 2019 equivalent of $1,000,000 a year in untaxed gifts from his father.[6] At age 23, he made an unsuccessful commercial foray into show business, investing $70,000 to become co-producer of the 1970 Broadway comedy Paris Is Out![7]

from Wikipeadia . no mention.

This account does not seem to be in question, his backing came from his father.