I have dro lnbs that are at least 20 years old and they still work!
Frequency drift can be a concern when transmitting or receiving narrow signals such as data from a has station, oil company, or a weather station. Frequency drift is not much of a concern when receiving signals designed for television. Television signals usually produce a much wider signal when compared to a data only signal, so frequency drift is not as critical for television as it is for small streams of data.
It could be said all lnbs have frequency drift. But again you are receiving pictures for television so a small amount of lnb drift does not matter.
You may test this yourself by moving any transponder frequency 1 MHZ at a time until you lose signal. Most of our satellite transponders are extremely wide and the transponder frequency can be changed by several MHz before losing the signal. Try it yourself and see.