If https can mean one of two things, but http2 clearly means only one thing, why would anybody choose to use the term https unless they are trying to be deceptive?
https and HTTP/2 are not the same thing, though. Until HTTP/2 traffic is the vast majority when compared to HTTP/1.1 with TLS, you can't claim https and HTTP/2 are the same.
For example, if you terminate your secure traffic on an AWS ELB (or using S3, or CloudFront), you are serving HTTP/1.1 with TLS. And will be for the foreseeable future.