Regarding the two Exhumed songs on the split, Metal Archives notes:
"Recorded during the same session as Totally Fucking Dead. Originally planned to be included on Gore Metal, but ended up not being allowed to, as both were written entirely by Ross Sewage."
I couldn't find any current contact info for Retaliation, but I did accidentally contact a German Technical Death Metal band on Facebook also called Retaliation. I think it's solid metal, check it out after you're done here.