Snark and bias are the stock in trade of the anti-Trump legions. If The Donald had said that the proceeds of the last night’s fundraiser were going to wounded veterans, than that is where it is going. People may not always agree that The Donald has always donated his time, money and effort to equally worthy causes, but unlike certain other foundations, he does not welch.
Welching - to not pay a person as promised, for some form of debt or losing side of a bet.
He always gave big to planned parenthood. Like you say, he is not a welcher.