IOS app node categories

Using the IOS app I see that I can toggle “online” nodes, my assumption is that the “online” nodes with “Lora” also selected are other nodes that my device sees at the moment, however I’m doubting that as not every “online” node has a signal bar/meter beside it denoting signal strength.
Does the “online” selection only show devices that are actively connected or were recently contacted and the signal bar denote nodes that my node very recently TX’d or RX’d to/from?

I seem to be getting sporadic connections at long range with some nodes, in the attached screenshot I am Bluetooth connected to B7E9, ED98 is less than 20 yards from it, and BLX2 and 6716 are miles and miles away. So I’m struggling trying to decipher the correlation of “online” and “online with signal strength indicator”.