If you have implimented the recommendation by the offical developer and it hasnt worked there are steps you can take which could help rectify the issue further.
Add an additional deliration for an image size option
Official documentation regarding images can be found https://devdocs.magento.com/guides/v2.3/frontend-dev-guide/themes/theme-images.html but for refernece the 3 different types are
Once you have added the above to your view.xml and please make sure you backup before doing any file edits.
Run the following command to regenerate your images, this will create a new cache based version of you images
php bin/magento catalog:image:resize