I run iOS 13 on my XS and I can definitely peek/pop on safari links.
I am running iOS PB4 on my XS Max.
You CAN peep an peek/pop links with either 3D touch or long press/haptic touch
You CAN 3D Touch or Long Press icons on your springboard to brign up the shortcut menus
3D Touch IS still active alongside Haptic - 3D touch is quicker but I am trying to use Haptic more so I transition to a new iPhone easier in future.
Anyone saying 3D touch has GONE on a X/XS/XS Max is WRONG.
I am literally sat here and can do the peek and pop as per iOS 12.... Maybe these people struggling with it should play about a bit more.
As discussed above, it is not the same as before and is not a “peek“ with light pressure and a “pop” with more pressure. It’s either, activate the contextual menu with a long press or a hard press. Either way you get the type of screen attached. Pressing harder will not open the “peeked” link full screen, so there is no longer any “pop”action.