Maybe an item on the agenda such as “Discuss and resolve the issue with regards to unapproved installations in common property roof space.” would be a starting point? Although if you request something like this, just be aware that your name may be associated with the point / motion on the agenda.
And, if the majority are happy with it, the discuss and resolve may result in the owner being allowed to keep everything there subject to a special by-law being created and passed at the next meeting for exclusive use and maintenance and responsibility for damage of the installation.