No, it's just not true.

Interop 2025 is a subset of web features, but Apple gets a veto on which features get included in each Interop round, and vetoes heavily. It doesn't reflect interoperability in general. Safari also consistently starts out the worst each year, and improves the slowest.

They don't support notifications correctly, they have a semi-broken implementation. Only a subset of sites will work, even though they'll work perfectly on Chrome or Firefox or even minor browsers. Even if you put the site on the homescreen.