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Version Information:
Forum version: SMF 2.0.15 (more detailed)
Current SMF version: SMF 2.0.15
GD version: 2.2.5
Database Server: MariaDB
MySQL version: 10.2.19-MariaDB-log
PHP: 7.3.11-1~deb10u1
Server version: Apache
Before anyone "yells" at me, I don't have any choice on the PHP version. You might want to revise the Basic Server Requirements (https://download.simplemachines.org/requirements.php) within SMF's documentation that says "PHP 5.4.0 or higher", cause 7.3 is definitely higher than 5.4.0. ;)
If you can't drop the PHP to 7.1 you'll just have to turn error reporting off until SMF 2.0.16 comes out. Your issue is PHP 7.2+ has a hissy fit with the bbc parser (and other parts)
I know it is not the page you linked to but https://wiki.simplemachines.org/smf/SMF2.0:Requirements_and_recommendations says
LainaaVersions of SMF from 2.0.14 onwards require a version of PHP between 5.4 and 7.1. If you use PHP 5.3 or lower, it is necessary to use SMF 2.0.13 or lower. PHP 7.2 is not supported by SMF at this time.
also this topic has come up many times here so a search would have given you the answer as well.