30 comments in two hours how fast are they deleting them?
They probably know shit's about to go down before the chapter dropped, so they were prepared to delete if necessary.
Please keep in mind that the web admin has two options:
1) Delete comments which causes the counter to drop. And since new comments keep coming in, this means they deleted more than 30 comments
2) Hide comments which doesn't affect the counter. Maintaining a high comment counter helps generate interest in the chapter.
In conclusion, the web admin deleted and hid much more than 30 comments in 2 hours! LOL