Call to Action Button in Greek in Social Media Ads

you know those "learn more" buttons you can click in social media ads.

We were supplied some ads in Greek by a third party, and they phrased "learn more" as "ΜΑΘ. ΠΕΡΙΣ".

my client asked her Greek colleague and he said that's not Greek and it's wrong.

When I asked Chat GPT, this is what it told me:

The Greek text circled in blue in the image reads "ΜΑΘ. ΠΕΡΙΣ." This is an abbreviation for "Μάθε περισσότερα," which translates to "Learn more" in English.

This phrase is commonly used in online ads or informational material as a call-to-action button.

Who is right? Chat GPT or my client's Greek colleague?

Thanks for your help!