That's completely made up and unsourced - and it would be equivalent to the annual amount he puts into his own foundation.
He's smart enough to know that donations to BLM are simply lining the pockets of its founders.
More significantly he's raising money for Hillary Clinton.
That's rational, not pouring cash into a Twitter fad.
I've heard Oreilly and Limbaugh and several other credible people who are not liberals say that he did. What is your source for it being incorrect?