Hello Jack,
Thanks for contacting us.
We have two options to delete these posts.
Delete Posts based on user
You mentioned that all the spam posts were added using your username. Do you have any good wiki posts as well in your name? If not, then you can use our “Bulk Delete Posts by User” addon to delete all the posts based on the username.
Delete Posts based on content
If all the spam posts have a common word or link then you can our Bulk Delete Posts by content addon to delete the posts based on that common word.
Let us know if the above suggestions were useful.