Board Thread:General Discussion/@comment-75.88.223.7-20170617051005/@comment-25122143-20170617092714

No more canon than Renora was following Boop, which is to say, nothing except vague, albeit heavy, hints and implications, until Volume 4. So, this is likely foreshadowing Bumblbee for Volume 5 or 6; I have faith that this isn't just "a fun little apology for the delay" or "softening the blow when Blake is revealed as straight", and that RT has matured from their days of homophobic jokes in the Blood Gulch Chronicles to understand why doing that would be wrong.

So, no, it isn't canon yet, but it is HEAVILY implied!