This edit fixed all the obsolete <tt> tag errors on the mw:Continuous_Integration/Zuul page but the LintErrors page continues to list it as of 90+ mins after that edit.
Not sure if this is simply a delay in when Parsoid is reparsing the page via ChangeProp or if this is a bug in the Linter extension code. IIRC, the Linter code removes stale entries from the database after a page is parsed via Parsoid.