It's hard to say whether Google would solve the problem. Especially since I don't know if it worked with Mercatox last time, and Mercatox is so difficult to deal with that no one knows who the CEO is, where the headquarters are, etc.
Trust me, I don't think reporting Google Safe Browsing did the trick last time round. Mercetox probably acted due to a different reason. Google Safe Browsing is mostly effective against phishing or clone sites, and we all know that Changelly is not a phishing site.
However, you could try making noise allover Reddit, x.com, different forums until you get noticed and helped. You just have to hope that they still have a bit of shame to care about their reputation.