Some blank false positives aside:

$ ag -o '^ *class \K([^ ]+)(?= .*extends .*renderer)' | grep -v '_renderer'
blocks/rss_client/classes/output/renderer.php:38:renderer
blocks/myoverview/classes/output/renderer.php:37:renderer
blocks/starredcourses/classes/output/renderer.php:36:renderer
blocks/myprofile/classes/output/renderer.php:38:renderer
blocks/lp/classes/output/renderer.php:38:renderer
blocks/search_forums/classes/output/renderer.php:38:renderer
blocks/recentlyaccesseditems/classes/output/renderer.php:36:renderer
blocks/timeline/classes/output/renderer.php:37:renderer
blocks/recentlyaccessedcourses/classes/output/renderer.php:36:renderer
course/classes/output/recommendations/renderer.php:34:renderer
privacy/classes/output/renderer.php:35:renderer
customfield/classes/output/renderer.php:38:renderer
auth/oauth2/classes/output/renderer.php:42:renderer
group/classes/output/renderer.php:38:renderer
admin/tool/monitor/classes/output/managesubs/renderer.php:37:renderer
admin/tool/monitor/classes/output/managerules/renderer.php:37:renderer
admin/tool/langimport/classes/output/renderer.php:38:renderer
admin/tool/templatelibrary/classes/output/renderer.php:37:renderer
admin/tool/lp/classes/output/renderer.php:39:renderer
admin/tool/oauth2/classes/output/renderer.php:43:renderer
admin/tool/usertours/classes/output/renderer.php:35:renderer
admin/tool/dataprivacy/classes/output/renderer.php:41:renderer
admin/tool/lpmigrate/classes/output/renderer.php:39:renderer
admin/tool/cohortroles/classes/output/renderer.php:39:renderer
admin/tool/policy/classes/output/renderer.php:41:renderer
admin/tool/analytics/classes/output/renderer.php:40:renderer
admin/tool/customlang/classes/output/renderer.php:37:renderer
enrol/lti/classes/output/renderer.php:39:renderer
message/output/email/classes/output/renderer.php:38:renderer
message/output/email/classes/output/email/renderer_textemail.php:36:renderer_textemail
message/output/email/classes/output/email/renderer.php:36:renderer
user/classes/output/myprofile/renderer.php:35:renderer
grade/report/history/classes/output/renderer.php:39:renderer
question/type/multianswer/renderer.php:268:
question/type/multianswer/renderer.php:462:
question/type/multianswer/renderer.php:646:
search/classes/output/renderer.php:36:renderer
report/competency/classes/output/renderer.php:39:renderer
report/insights/classes/output/renderer.php:40:renderer
report/configlog/classes/output/renderer.php:36:renderer
mod/forum/classes/output/emaildigestfull/renderer.php:37:renderer
mod/forum/classes/output/emaildigestfull/renderer_textemail.php:37:renderer_textemail
mod/forum/classes/output/email/renderer.php:39:renderer
mod/forum/classes/output/email/renderer_textemail.php:37:renderer_textemail
mod/forum/classes/output/emaildigestbasic/renderer.php:37:renderer
mod/forum/classes/output/emaildigestbasic/renderer_textemail.php:37:renderer_textemail
mod/lti/classes/output/renderer.php:37:renderer
mod/book/tool/print/classes/output/renderer.php:41:renderer