We can’t comment on the tradesman issue without further explanation. However, if a motion was passed at a properly constituted meeting of the executive committee to issue a Notice To Comply with a by-law, then the strata manager should have done that. If they haven’t, they need to explain why not. But if there was just a semi-informal request to the SM to chase an issue up, they may have felt a less aggressive approach was appropriate.
If the SM is refusing to comply with a reasonable instruction, you have a problem. Either way, it’s time for a “please explain” meeting.