Yes, some NBC affiliates -- at a minimum the ones owned by
Sinclair Broadcasting Group, are right wing "propaganda." They have "speeches" that they require all of their outlets anchors (193 media outlets in 100 US media markets) to repeat, verbatim:
If "letters" claimed to be from a Trump laptop were being offered to left wing media, but not right wing media, with typically no way to validate them; if CNN and MSNBC were claiming they would not run the story because they did not find evidence against Pres. Trump, though possibly some things about his children; is the story was being sent to media by a Clinton lawyer (for example, Sussman), would you have believed the story?
Realize this is what happened, just from the other side. They were being offered by a Trump lawyer, left wing media outlets were not being allowed to see the emails or other evidence, the WSJ and Fox News were refusing to report because they found no actual evidence of ties to Joe Biden (despite having talked to Tony Bobulinski and having access to emails and text messages).
The big issue with the Hunter Biden laptop is that most of the information was coming from the "Trump campaign." Bobulinki's public comments were typically, like with the pre-draft press conference, arranged by the Trump campaign, the emails themselves came from Trump's lawyer (Giuliani) and the "MSM" wasn't even being allowed to see full copies of the emails; and two "right wing" outlets refused to report the story, either, saying they had seen no real evidence that implicated Joe Biden. I'm not sure what you expected the MSM to do, particularly when Fox wouldn't (apparently including Tucker Carlson), either.