Author removed a regular article image that points to Instagram. There is no indication/tag/class of this being a social link and it's not consistent.

"6.3.6 Social media links
Sharing buttons and other interface-based links must be removed as per 4.
Many articles include something like “check out our facebook page” at the end of every text. Such links must be removed if they are consistently placed in an identifiable container."

There is no secure and reliable way to remove it without risk of removing legitimate content. This can lead to the removal of a legitimate image that points to related instagram post/comments in another article, future or past. Also, are you going to regex for every social media site out there in your template?