<hgroup> being used?

[PhoneDroid]

I was wondering why <hgroup> was used here

It has an h2 & h3 element which following the docs is not a valid use case. ( Valid : 0 / 1 <p> + 1 <h1-6> + 0 / 1 <p> )

The MDN Docs also mention the following:

Note: The <hgroup> element is not recommended as it does not work 
properly with assistive technologies. It was removed from the W3C 
HTML specification but is still part of the WHATWG specification 
and is at least partially supported by most browsers.