On the pages undeletable due to too many edits, yes, stewards should be able to fry those via the backend.
The issue stems from the fact MediaWiki is powered by a relational database with a hard frontend cap of 500 edits any one person is allowed to delete. This is done to prevent the server the crapping the bed due to the size of the deletion job and the power needed to delete the revisions from the database tables.
They can still be removed via the backend fine, but yes, any pages in excess of 500 edits are going to need steward intervention to kill off for any reason.
The issue stems from the fact MediaWiki is powered by a relational database with a hard frontend cap of 500 edits any one person is allowed to delete. This is done to prevent the server the crapping the bed due to the size of the deletion job and the power needed to delete the revisions from the database tables.
They can still be removed via the backend fine, but yes, any pages in excess of 500 edits are going to need steward intervention to kill off for any reason.