The keyword here is web-based. Yes, applications installed through vendor stores can handle SEP7 links on Android & iOs. Webapps can't. That's my point & I think my assertion is accurate.
For the background, I'm not a bored troll spitting random data for the fun of it. I've brought delegated signing into Stellar 20 months ago & since then most of my work revolved around it. I've explored many possibilities to find the best solutions and extensively commented on the subject. I've spent hundreds of hours working around this feature, as this is the central element of my software.
I'm happy that devs finally get into it because that's the very point of my efforts. However, that's a bit annoying to see people waking up months after the battle & start contradicting - twice on the same point - without even checking the facts.
The issues I've bought about SEP7 are well-known and were found by myself in the days SEP7 was still a draft. Those are the very reasons I continued to develop CosmicLink instead of withdrawing, as I know that this is an overall better-designed solution that is likely to become the community pick.
The source I used to claim that only 35% of the browsers can register web-based handlers for SEP7 is caniuse.com. Their data is the foundation over which software such as Babel or Browserlist is built and are perfectly reliable. Virtually every software - including yours - rely on it as this is the reference of what browsers support and what they don't.
Finally, I regularly check my software under various OS & browser - so I know the data is correct. Which means I also know that you did not properly test your product on the mentioned platforms.