I know FG's in recipes are not to be relied on, but this has an OG of 1.052 and an FG 1.022? I'm thinking this should be 1.012?
style guideline speaking- baltic porter would be more in the FG range of 1.022. a brown or robust porter is more towards your 1.012.
all depends on what you want.
EDIT- looking at the recipe, I'd be shocked if that recipe would even come close to 1.022. I would expect closer to the 1.012 as you mentioned.