This is normal. The fix often uses the AppID for "SpaceWar" (a developer tool) to route multiplayer data through Steam.
To get the multiplayer functionality working, you must follow the installation sequence precisely. Skipping a step often results in the "No Servers Found" error. arma 3 mp cracked steamworks fix nino23 link
Once the fix is applied, you cannot simply join any official server. Most official servers use BattlEye, which will immediately kick or ban players using modified Steamworks files. This is normal
Search for servers that have BattlEye disabled or are labeled as "Cracked" or "No-CD." check the Internet tab.
In the server browser, check the Internet tab.