[bairy]

Yes. 3.5's deletionlog doesn't have a dateline field.
I don't think the deletion date is recorded at all in 3.5.

a) You can't use this 3.6 product.
b) You can edit the code so it doesn't left join the deletionlog table, though that means that the "how many deletions have they done in the last x mins" won't work (meaning people can delete all they want), and makes the "how many edits and deletions have they done in the last x mins" more unreliable. However it will still be acceptable if people only edit, e.g. if you don't allow people to delete their posts.
Even with that fixed there may be other problems on 3.5