Are all new nVidia cards gimped by LHR now? Even the 3080 and 3060Ti's?
The new batch yes it is.It is very difficult to find a new RTX 3060 ti non LHR while for RTX 3080 you maybe a bit more lucky and manage to find one but for the 3060 ti is impossible to buy it new non-LHR now.I would still buy it used non LHR though as it does pretty well at 58-60 Mhsh for 120 watt power consumption.
The LHR are easy to spot though,each brand has its own code,for example Gigabyte rev 1.0 is non-LHR card while rev 2.0 is a LHR card.
It's easier to detect a LHR gigabyte GPU, the difference is just v1.0 and v2.0 and also in my country many GPU sellers still have non LHR versions available for sell I'm surprised you said they are scarce, the reason I'm not buying is because of bear market