Lab grown meat still requires live animals. You still need to collect stem cells to start a culture and you also need fetal bovine serum (blood plasma from baby cows) to keep the cells healthy.
We currently DO NOT have a way to culture mammalian cells without animal blood plasma. We currently DO NOT have a way of infinitely culturing mammalian biomass from a single cell sample. So lab grown meat still needs animals to be raised in captivity and slaughtered, just fewer. It's not vegan for that reason and won't be for the foreseeable future unless massive breakthroughs happen in multiple different fields.
IMO a better path to explore would just be to figure out which exact chemicals give meat their flavour and directly synthesize them from raw materials. Have something like a completely artificial bacon powder you can add to a vegan protein source and completely cut out anything to do with animals. We can make every other scent and flavour artificially, why not meat? And it's not even that hard, a science YouTuber can do it.