So the word is that they were doing not only measurements, but testing as well --- endurance, strength, etc. Supposedly they had facilities in different markets where they arranged the tests and planned to bring guys in. I honestly don't know how many, but I don't think it was a high number. Things got shut down pretty quickly --- which is not surprising at all.
All of this off limits. The NHL puts all the vitals out there for teams and they all gain access to the same information. No outside testing.
Now, it is important to note that teams still do as much research as possible and look for information sources to give them a competitive advantage. But they are not permitted to arrange for any testing and measurements themself.