class TestType
{
    [SupportedOSPlatform("ios13.0")]
    [SupportedOSPlatform("maccatalyst13.0")]  // THIS suppresses lower versions
    private void Tapped()
    {
        if (OperatingSystem.IsIOSVersionAtLeast(15,0))
           DoSomething(); // when it called here only [SupportedOSPlatform(""ios14.0"")] left in the list
                         // as OperatingSystem.IsIOSVersionAtLeast(15,0) applies to ios15.0 and maccatalys15.0 warns 
    }

    [SupportedOSPlatform("ios14.0")]
    [SupportedOSPlatform("maccatalyst")]   // when version less or <= 13.0 then suppressed by callsite attribute 
    public void DoSomething() {}
}