Good catch OP although I don't know how accurate this statement is
I notice that Lols601 and Storm66 threads are always on the first page on top 10-15 threads.
According to bpip, both of them deleted only two of their own posts, so they haven't benn doing this for a long time. You just got them on the right time.
As suggested by TryNinja, report their last posts and explain, on the
comment field, what they are doing or simply ask the mod to visit this topic.