This is half right. PHP 7.3 is available from CentOS in addition to Remi.
Every time I do this PHP stuff I need a refresher course. Here’s what worked for me if it’s any help.
I decided to replace 7.2 with 7.4 as the default and 7.3 as the extra, both from Remi.
dnf module reset php
dnf module enable php:remi-7.4
dnf update php\*
With 7.4 a batch of basic extensions updated automatically, including php-fpm, since this was an update. Other extensions can be installed in batches.
dnf install php-openssl php-pcre php-posix php-sockets php-spl php-tokenizer php-zlib ... and so on
7.4 configuration files are
/etc/php.ini
/etc/php.d/*.ini
7.3 starts out bare since it’s new, so php-fpm and other extensions need to be installed manually.
dnf install php73
dnf install php73-php-fpm php73-php-mysqlnd php73-php-xmlrpc php73-php-pear php73-php-pdo php73-php-opcache ... and so on
7.3 configuration files are
/etc/opt/remi/php73/php.ini
/etc/opt/remi/php73/php.d/*.ini
For extra measure I restarted Webmin after restarting httpd and php-fpm.