https://wordpress.org/support/topic/update-adds-php-handler-to-htaccess/ referencing https://wordpress.stackexchange.com/questions/285577/htaccess-problem-after-saving-settings
This line kept getting added to htaccess and broke website:
AddHandler application/x-httpd-ea-php70 .php
Deleted 3 endurance caches that were brought over from Bluehost migration fixed the problem