of course not - because Alphabet is not Google
Google is a subsidiary :)
Ask 100 people "who owns YouTube? " - how many say Google, how many say Alphabet?
I think the parents point is that the entity legally known as Alphabet, is colloquially referred to as Google, even when not referring to the subsidiary known as Google.
Just change it now and move on.
It's cheaper to just change the name and users won't care if the product is good anyway.
So I'd recommend a rename, just to find something more creative and distinctive. Finding good names is hard, so I wish you luck on that, but it's worth the effort.
Right now, without even a product named meta, how can they even send cease&desists to the many companies out there named "Meta", who already have products and registered the trademark for meta ?
But right now, there's really no reason they will win! A lot of negative press is going to push back hard on the new name. As others have said, Alphabet is still just Google to most people. So build your project and don't get distracted by what's currently a non-problem.
Here's more context: https://medium.com/sheracaolity/my-vision-project-meta-e0bed...
All publicity is good publicity.