It's possible they were "hugged" enough to instigate a firewall rule dramatically cutting down allowed visitors, which would explain the Error 1020.
Might be worth reaching out to the site's creator -- info taken from their site [https://zu1k-com/about/]:
"If you have any questions to communicate with me, the preferred way is to comment directly in the comment area of the corresponding blog post, and I will receive an email notification
In addition, you can also reach me in the following ways:
Email: i@zu1k.com
Twitter: @zu1k_lv
GitHub: @zu1k
Keybase: @zu1k
Matrix: @zu1k:mozilla.org
My PGP public key can be obtained at https://pgp.zu1k.com or hkps: //keyserver.ubuntu.com
Might be worth reaching out to the site's creator -- info taken from their site [https://zu1k-com/about/]:
"If you have any questions to communicate with me, the preferred way is to comment directly in the comment area of the corresponding blog post, and I will receive an email notification
In addition, you can also reach me in the following ways:
Email: i@zu1k.com
Twitter: @zu1k_lv
GitHub: @zu1k
Keybase: @zu1k
Matrix: @zu1k:mozilla.org
My PGP public key can be obtained at https://pgp.zu1k.com or hkps: //keyserver.ubuntu.com
( 2A65 F6F3 1EDA D922 D7E7 E97B AE38 1A8F B1EF 2CC8)"