IMHO, when AWS uses HTTP/2 and not HTTP/1.1 over TLS, then you can start claiming that https === HTTP/2. Until then, you've moved the goalposts well beyond what most of your peers would consider to be reasonable.

As a side note - what is the standard regarding multiplexing for terminating HTTP/2 proxies: i.e. how much multiplexing could make it across that boundary? Or is that a bridge we haven't crossed yet?