Contact the company that maintains the website then. You are making conclusions without doing the proper DD.
Like I stated before, HNSS may have got their preliminary info about the expo the past few days (after registering) and they may have felt that it would be worth while to update shareholders about it. Healthnostics has no control over what is or what is not updated on a 3rd party's website.
They state that they are launching a machine that is worth over a quarter of million dollars. Do you seriously believe they will not have a booth? It may cost a few grand for 2 days, but it will be well worth it. I think you are punching yourself in the gut here.