Just had a look and for me it also says "Invalid thread specified".
This means that either it's gone into the moderation queue, or it's been hard-deleted by one of the Support Team or Community Team.
As a rule of thumb, if it says "Invalid Thread Specified" then it's either in the mod queue or deleted
If it says "No Thread Specified" it's been hard-deleted (i.e. totally gone from the site)
If it says "<username>, you do not have permission..." it's been soft deleted (i.e. moved to the recycle bin)
Hope that clears things up.