Found this archive link to the killers gab account. Was posted on GP comment section.

https://web.archive.org/web/20181027160428/https://imgur.com/a/cwB9QkR

https://www.thegatewaypundit.com/2018/10/report-pittsburgh-shooter-named-on-police-scanner-is-a-nazi-hated-donald-trump-thought-trump-controlled-by-jews/