Trump legitimately campaigned on being cruel to illegal migrants and refugees. He also campaigned on reducing immigration in general. To that extent, you are correct inasmuch as Trump's H1-B policies were promised. (MAGA wasn't subtle [1].)
Where I think we can legitimately say this is MAGA versus Republicans is in the reverse brain drain. America in the 1950s was a destination for top minds. Ameirca in the 2020s is not. Part of that is due to remote work. Part due to us not being in the wake of a world war. But part was due to an explicit policy to attract the most ambitious to America, and then to encourage them to stay.
[1] https://m.economictimes.com/news/international/world-news/wo...