The Hi-Res Winds Mode is gathering special high resolution wind data only available on the internet. This is why you are seen this message. However we are looking at a change in the future.
I have proposed to revised Winds Aloft Mode, and have a qualifier (Hi-Res) or (ADS-B). For the Hi-Res, you'll see what you see now if connected to the internet, then when on ADS-B, we would only show the much more limited report stations with a Altitude Slider or option for an altitude setting, as there is no time forecast for ADS-B winds. This would give the Winds Aloft Map Mode more consistency and functionality for both Internet and ADS-B usage.
Note: With only ADS-B Winds, there would likely me some limitation for the Altitude Planning feature since wind data would be very sparsely located and less accurate for cross country optimizing.