I believe that Trump's decision to support the crypto industry is a logical and positive step in his campaign. At the moment, people are greatly concerned about this issue and the actions of the current administration have caused fears among the public, which could affect the election results.
Trump, is leveraging on the rising popularity of Bitcoin to gain more votes in the coming election, he knows that the number of Americans that are into cryptocurrency is increasing. So it doesn't really matter what his personal stance is on cryptocurrency, what matters at this time is to align with what will give him votes and that is being crypto friendly. The brothers donation is a boost to getting votes from the crypto community in America, if more notable bitcoiners will be openly giving him support, I'm sure that it'll be an edge for him against Biden, that has clearly shown lack of support to the growth of Bitcoin and the rest of the cryptocurrencies in America..