Post creation rather than revision date?

Hello

I have been using Customizr for a great while now. A problem that bugs me is that all my posts display their last revision date rather than their creation date. It’s a problem for SEO I think, especially as I had to change my url structure lately. Rather than showing a dripped content over the past 3 years, it looks like all my posts have been created this year. Is there a way to force Customizr to display the original creation date instead for all posts and pages? Thank you…

If needed, the site: https://www.laurentlanglais.com