Cleaned up obsolete properties from MobStateComponent (#13097)

Co-authored-by: Jezithyr <Jezithyr@gmail.com>

Content.Server/Medical/SuitSensors/SuitSensorSystem.cs

@@ -2,6 +2,7 @@ using Content.Server.Access.Systems;
 using Content.Server.DeviceNetwork;
 using Content.Server.DeviceNetwork.Components;
 using Content.Server.DeviceNetwork.Systems;
+using Content.Server.MobState;
 using Content.Server.Popups;
 using Content.Shared.Damage;
 using Content.Shared.Examine;
@@ -22,6 +23,7 @@ namespace Content.Server.Medical.SuitSensors
         [Dependency] private readonly PopupSystem _popupSystem = default!;
         [Dependency] private readonly IRobustRandom _random = default!;
         [Dependency] private readonly IdCardSystem _idCardSystem = default!;
+        [Dependency] private readonly MobStateSystem _mobStateSystem = default!;
         [Dependency] private readonly DeviceNetworkSystem _deviceNetworkSystem = default!;
         [Dependency] private readonly IGameTiming _gameTiming = default!;
 
@@ -244,7 +246,7 @@ namespace Content.Server.Medical.SuitSensors
             var isAlive = false;
             if (EntityManager.TryGetComponent(sensor.User.Value, out MobStateComponent? mobState))
             {
-                isAlive = mobState.IsAlive();
+                isAlive = _mobStateSystem.IsAlive(sensor.User.Value, mobState);
             }
 
             // get mob total damage