Tis article gathers a few hypothetical evidence that shows that Hal Finney could not be Satosi Nakamoto. The author also believes Satoshi Nakamoto is/was a single person.
At the start, I only had feelings that Hal Finney is not the Satoshi, but after reading this article you have provided, I can say, yes Hal Finney is really not Satoshi, I only checked 1 to 2 proofs provided on the website and I was convinced with them. I came to know about Hal Finney when the day of first Bitcoinist was celebrated, a topic was also created -->
Today marks 9 years since the death of Bitcoin first pioneer Hal Finney,
I learned a lot about Hal Finney and also read his last post made on BTT. -->
https://bitcointalk.org/index.php?topic=155054.0 (by Hal), He was facing a lot of issues and in that post, he already mentioned that he talked with Satoshi over the email so many times and he said, he thought Satoshi was some Japanese guy.
This also indicates that Hal was not the Satoshi but only a cryptographic expert who was overwhelmed with BTC cryptography. A fan of BTC.