As a licensed engineer, you are overselling what it means to be licensed. We do not use it as a trademark. It is more a restriction on using it in making design decisions that could impact public health and safety, and in particular, approving plans for such designs.

Really only civil/structural engineers pursue licensing routinely (although a few other branches that deal with major construction, like HVAC/plumbing branches of mechanical engineering). The vast majority of engineers are not licensed, but so long as you at not practicing in one of those areas restricted by law and regulation, you are fine. And certainly offering opinions and criticism of the design decisions of others is never forbidden. This case was ridiculous