The research in the article was not quite clear. Was their only “sign of life” measured by tweets? What about capitalization, transaction volume...anything?
And more to the point, tiny two- and three-person shops probably aren't doing ICOs. If your company is big enough to undertake a public offering of any kind, it's damn well big enough to have someone on staff whose responsibilities explicitly include some kind of community relations work.
Every regular company that has taken on funding at least has a 'web site' with 'some information' and definitely communicates with investors etc. on what's up.
That it's not really even possible to know 'whats up' with companies that have raked in millions is in of itself very telling. Telling enough to keep me and most others miles away.