Tried with MW 1.30, only links to the twitter page. No display
Topic on Extension talk:TwitterTag/Flow
I suggest updating to a newer version, 1.30 is already several years old. The extension certainly does work on a wiki using 1.34 and several Miraheze wikis.
It does work with Mediawiki 1.41 in the Mediawiki desktop webinterface on wiki Christipedia.miraheze.org and in the mobile webinterface, on my Windows 10 laptop with Google Chrome browser. However, the extension does not work in the mobile webinterface on my Samsung Android Smartphone. It does work in the Mediawiki desktop interface on my smartphone.
My testpage: https://www.christipedia.nl/wiki/Gebruiker:Kees_Langeveld/Twitter