No, he's absolutely correct AND so are you.
How do I know? Because I've had beta 2 do it both ways for me.
When I first OTA updated iOS 10 to beta 2 it wouldn't let me in until I pressed the home button. The rest finger to unlock setting switch didn't do anything for me. Then I had to get my screen fixed and when I did, in order to calibrate the screen, the apple techs had to roll it back to 9.3.2 (calibration software doesn't work on iOS 10 yet). When I upgraded back to iOS 10 beta 2 I no longer have to press the home button to unlock it to the home screen.
Obviously it's a bit buggy on which way Apple wants it. This is on a 6 Plus not 6S. I haven't turned on the rest finger to unlock setting.
Remember, iOS betas can behave differently on different devices and sometimes different installs. Just because you have a specific experience does not mean it matches everyone else's. It's all part of getting rid of the beta bugs. That's one important reason they have public betas.