That doesn’t matter at all. He won the primary with a grassroots campaign, so he doesn’t need their funding. Being in the blue/Working Families column will win the know-nothing vote in NYC.
The key is for us to seek out the progressive on the primary ballot and vote. We shouldn’t be rewarding the candidates that have the financial means to find us in our living rooms. Sign up for mailers if you forget to vote. Sign up for mail-in ballots if you have an irregular schedule.