RESTful interfaces and headless implementations have been on the minds of developers and less technical people alike. This has been the state for a number of years now and frankly the REST hype is getting a bit long in the tooth.
While REST is a technology with merits, the problem is that REST is only used as a baseline technology definition in most cases. There is no specific definition on what a REST API is, that's why many resort to calling them RESTful - to describe that they sort of fulfil the definition. But without knowing exactly what is meant by REST, it's hard to say.