PS2 - FunTuna (Free McBoot for Fortuna), Page 8

Well you are wrong. Tested that (as has multiple others). I believe there is even multiple comments about it in this thread.

FunTuna (Free McBoot for Fortuna) - The Independent Video Game Community

Cannot launch any app through Fortuna

PS2 - FORTUNA FMCB Launcher by VTSTech, Page 2

Free McBoot v1.966 Fortuna SD Card Adapter 8MB/16MB/32MB/64MB for PS2 Slim/Fat

PS2 - FunTuna (Free McBoot for Fortuna), Page 6

TONKBEEY Free McBoot V1.966 & Fortuna Card Compatible with PS2 MX4SIO SIO2SD OPL Installed SD Card Adapter for Slim/Fat Console

Fortuna FMCB Launcher : Veritas83 : Free Download, Borrow, and Streaming : Internet Archive

Ps2 Homebrew Apps

Bitfunx Fortuna FMCB Free McBoot Memory Card for Sony Playstation 2 PS2 Slim Game Console

PS2] Tutorial, Funtuna, Instalação