which type of certificate product is used for Cloudflare Pages

Hello, I have a question regarding the SSL/TLS certificates used by Cloudflare Pages. With the upcoming changes to Let's Encrypt's certificate chain, I am trying to understand which type of certificate product is used for Cloudflare Pages. Can you confirm whether it uses Universal SSL, Advanced Certificate, SSL for SaaS, or Custom Certificates?

I'm particularly interested in knowing this because of the following article, which suggests that no action is needed if Universal SSL is used.
https://blog.cloudflare.com/shortening-lets-encrypt-change-of-trust-no-impact-to-cloudflare-customers

Thank you!
The Cloudflare Blog
Let’s Encrypt’s cross-signed chain will be expiring in September. This will affect legacy devices with outdated trust stores (Android versions 7.1.1 or older). To prevent this change from impacting customers, Cloudflare will shift Let’s Encrypt certificates upon renewal to use a different CA
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