Update based on feedback

src/VideoToolbox/VTVideoEncoder.cs

@@ -113,6 +113,18 @@ namespace VideoToolbox {
 #endif
 		public bool SupportsFrameReordering { get; private set; }
 
+#if !XAMCORE_4_0
+#if !NET
+		[NoiOS, NoTV, NoMacCatalyst, NoMac, NoWatch]
+#else
+		[UnsupportedOSPlatform ("ios")]
+		[UnsupportedOSPlatform ("tvos")]
+		[UnsupportedOSPlatform ("maccatalyst")]
+		[UnsupportedOSPlatform ("macos")]
+#endif
+		public bool SupportsMultiPass { get; private set; }
+#endif // !XAMCORE_4_0
+
 #if !NET
 		[iOS (15,0), TV (15,0), MacCatalyst (15,0), Mac (12,0), Watch (8,0)]
 #else

src/videotoolbox.cs

@@ -1044,10 +1044,6 @@ namespace VideoToolbox {
 		[Field ("kVTVideoEncoderList_SupportsFrameReordering")]
 		NSString SupportsFrameReordering { get; }
 
-		[NoTV, NoMac, NoiOS, NoMacCatalyst]
-		[Field ("kVTVideoEncoderList_SupportsMultiPass")]
-		NSString SupportsMultiPass { get; }
-
 		[TV (15,0), Mac (12,0), iOS (15,0), MacCatalyst (15,0)]
 		[Field ("kVTVideoEncoderListOption_IncludeStandardDefinitionDVEncoders")]
 		NSString IncludeStandardDefinitionDVEncoders { get; }