Shaun J. Stuart points out impoliteness on the part of In-Memory OLTP:
It’s nice that they are labeled with [INFO], so you can be fairly sure they aren’t a major issue, but they still annoyingly fill up the log with information that is of no use to anyone outside of Microsoft. It would be nice if you could disable these messages but, to my knowledge, you cannot.
These are the types of error messages which should, by default, not write to the error log. My real bugbear is “Hey, we successfully backed up the transaction log!” You should not need a trace flag to turn that off; you should need one to turn it on for diagnostic purposes.