Activity can not be a good indicator to find alts. To be honest I have decent activities, no activities, some activities, several times no activities, low activities. The forum sometimes does not interest me sometimes does. Activities depend on your time, interest, goal and including many other factors.
Goal is a major factor for activities. Someone's goal can become a legendary, someone's goal can be earning from signature campaigns, someone's goal can be sharing their opinions others can have goal like me (no goal at all. Recently I am reading interesting topics, ignoring major discussions, if something looks odd only then sharing opinions). I like this forum because I can express me when I feel I need to.
With that being said, OP is not looking an honest member.
I would suggest you read more carefully what I wrote about activity and alternative accounts. You are not looking for a company signature to earn money, so your behavior can be absolutely anything. You can visit the forum whenever you want, or not at all. And to be honest, this conversation is not about you at all. But shouldn't someone who wants to advertise a certain company show the manager looking for people that he or she can be of interest to companies? Ask why managers don't accept people who have been absent from the forum for a long time.
I'm not saying that people are required to be very active, but often the history of posts changes dramatically from plus to minus and vice versa. Interest arises only in one financial sense: if a person is not in the company, then the forum is of little interest to him or her.
If we talk about signing a message from a Bitcoin address, then the OP was online several times but is probably again making up a story about slow Internet or something unique, since we have already heard a lot of similar cases.