I'm not sure you quite understand how the internet works
Or at least, I have no idea what you're saying
If there is no internet, then there is no line from your computer to anything online. There is no "detection" for Steam to boot faster than. Can you go on websites? If you can, then you have internet. If you can play games multiplayer, then you have internet.
What your dad might have disabled is certain different sites or places that you would use the internet on, in which case, it's just a glitch that you can get past it in the first place. Have you tried downloading a game? That would probably answer your question, lol