PHP 8.0.30 is installed as the default version
If you follow the Wizard instructions for “single/default version”, it will be updated
If you follow the Wizard instructions for “multiple versions”, it will be installed beside the default version (like 5.6 and 7.4 are)
In your article, you explain how to use “php-cgi” which is probably the worst way (performance) to execute PHP, yous should use “php-fpm” instead, you can read:
- and old article (EL-7 time): PHP Configuration Tips
- an article on my blog: My PHP development Workstation which I also use on my server (EL-8) to run 7.4 and 8.1 simultaneously.