Start WALC via terminal

[amk91]

This may sound really dumb and I'm sorry in advance, but I currently cannot start WALC via terminal. My desktop entry is at opt/WALC/data/com.github.WAClient.WALC.desktop and this is the content

[Desktop Entry]
Name=WALC
Exec=com.github.WAClient.WALC
Terminal=false
Type=Application
Icon=com.github.WAClient.WALC
Comment=An unofficial WhatsApp desktop client for Linux
Categories=Network;Chat;InstantMessaging;
StartupWMClass=walc
StartupNotify=true
X-Flatpak=com.github.WAClient.WALC

I don't quite get the Exec, because I clearly cannot launch com.github.WAClient.WALC, but if I start WALC via my launcher (rofi) everything is fine. I can use the app without any issue.

Am I missing something?