Chrome initially planned to depreciate support for FTP from version 81 but paused it because of COVID-19 (to help hospital staff access FTP resources) . In version 86 (currently latest on Play Store) , support to FTP has been depreciated for 1% users and by Chrome 87, it will be depreciated by 50% (Source).
So if you are lucky (not in the 1%), enable FTP flag by pasting
chrome://flags/#enable-ftp in the address bar and launching Chrome again by pressing the prompt at bottom right.
Verified with this FTP site ftp://ftp.heanet.ie/ since link in OP can be accessed only from Iran.
If you can't access using browser, see this for other methods
How to connect an Android device to an FTP server?