Also respectfully, he stated patched daily. Generally, security updates for both iOS and Android devices happen in a monthly roll-up.
If your checklist for being "secure" involves being up-to-date, there is no amount of 'getting a better phone' that will put it on par with a desktop OS that receives daily patches.
Conflating secure with up-to-date is wrong in such a broad and sweeping statement such as 'your Linux desktop is always less secure than an iPhone'.
Updates software does not instantly mean more secure, which I am sure you are aware of.
As you stated, for the generalists, yes, an out-of-the-box iPhone has more hardening than an OOTB Linux desktop, but for the type of person on HN, this is not necessarily true at all. There are too many variables.