Biden the most pro-union President ever?

That's what he promised when campaigning. He also said that unions was were only way to negotiate fair wages and conditions with business. But now that there are numerous labor strikes going on around the country we've heard next to nothing from Biden and certainly not corporate media. So why isn't Joe out there supporting the strikes if he's so pro-union? That would force corporate media to cover them too. The rhetoric ain't matching the behavior and I'd like to know why Joe?