They use the servicios-nic.com.mx nameservers which have problems with IPv6.
I would expect you to get "SERVFAIL" or "query timed out" errors from Let's Encrypt. "NXDOMAIN" seems strange.
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They use the servicios-nic.com.mx nameservers which have problems with IPv6.
I would expect you to get "SERVFAIL" or "query timed out" errors from Let's Encrypt. "NXDOMAIN" seems strange.