What if 1 person creates 50 different topics all in the same page 1? Would that not be considered spam since that 1 person will take up the whole entire first page?
If you can provide evidences that the threads are created by multiple accounts owned by one person, then it's a spam case and you can report it here.
For the case you mentioned, I think you don't have solid proofs that they belong to the same user (more valid connections), although it's allowed by forum rules to have alts.
Your spam-report seems to be only based on doubts.
You can share those doubts in other boards (rep or acc), not here.
Use the "move" button in the left bottom of this thread for board-change.