We can’t say if there’s a circumstance where the OP will not be able to come online for some time, maybe sick, busy or something. The users he or she added to their self-moderated topic could be of help during that period and it’s fine in my opinion.
The co-moderators of one topic should be chosen before you publish your self-moderated topic. I don't believe that theymos will allow to edit co-moderator list of a self-moderated if he deploys a new feature, co-moderated topic for community.
In addition, if you are the main moderator, the author of a topic, it's impossible to choose a co-moderator after you get an accident and no longer is able to use the forum.
Reporting to the forum moderators about such posts in such threads is like giving them extra work to do.
If the forum is clean and has good quality, forum moderators don't need extra works to do.