Hi @gavin,
I hope you are well today and thank you for your question.
Yes you are right that it likely wont impact search results as described in the following topics.
https://colorlibsupport.com/t/hentry-markup-microformats-org-missing-author-updated/
https://colorlibsupport.com/t/google-webmaster-tools-structured-data-errors/
Could you please try using latest version of this theme by downloading it from the below page to resolve this issue?
Best Regards,
Movin