Mashinsky is a conman. This has nothing to do with the SEC being coy about whether BTC is a security and everything to do with Mashinsky lying to his customers about the risk involved in investing through Celsius. Here's a clip of him getting called out on his lies in a debate with a Bitcoin hater:
https://www.youtube.com/watch?v=OBohJXhpRHU&t=2m7s