The link is to a post from Sugargrandpa, who continued to post for three months after this(total four posts). At which point Surfcrest announced that both Sglad and Sugargrandpa were the same person posting under two different handles and would therefore both be banned.
https://sawatdeenetwork.com/v4/showt...051#post214051
There is no mention that this conclusion was reached as a result of two posts from the same IP address as you assert(perhaps that's why you chose to link to an earlier post). In fact in a subsequent post in the same thread Fountainhall boasts of the fact that Sglad, who had contradicted Fountainhall several times, was "flushed out" as a result of a trap that he had set. That is the decision was nothing to with IP addresses. It was simply a subjective decision from Surfcrest, under pressure from Fountainhall, that may or may not have been correct.
Even a poster called a447(any relation?), writing in the same thread, seems to be suggesting that IPs are not being used to identify multiple handles :
This isn't therefore "conclusive proof" that Sglad used the same IP as Sugargrandpa, as you asserted, or even that they are the same person. As I recall you were both untrusting and critical of Surfcrest's judgment and moderation, so it would be bizarre if you now want to quote his judgment in support of your case against Sglad.