It would be at least as valid a strategy to avoid collecting any unnecessary personal information about your users, so that you don't have to worry about whether the information you've amassed adds up to "internal clear and convincing information".
Remember, only the state AG can bring a suit under this law, and the penalty is limited to $2500 per child for negligent violations. It's probably cheaper to get insurance against such a judgement than to implement an invasive ID-scanning age verification system (and assume the risks of handling such highly-sensitive personal information).
No platform is going to forgo analytics and using demographic information for advertising, that's their bread and butter.
I'd also argue it's clear and convincing if a kid changes their profile picture to a selfie of themselves, says they're 12, says they're in grade school, etc. Any reasonable person would take that at face value.
> implement an invasive ID-scanning age verification system (and assume the risks of handling such highly-sensitive personal information)
It's already implemented as face and ID scans by all the major platforms as it is. The systems are already there and they're already deployed.
Apps and platforms already integrate with 3rd party age verification platforms who handle the face and ID data, nothing ever has to touch your servers.