tbh I'm not 100% sure, but I do know that the old pits at Le Mans were used until 1990, after that it was new pits and I suspect it probably had a pit lane speed limit from 1991 because the earlier pit was barely a pit at all lol, I did search online without success to try and get a definitive answer.
It has been a while since I did track stuff but iirc the pit lane speed is set in the track itself, not the car, so whether they had pit speed limits or not, they will have in rF2. Of course I could be wrong
edit - I also see that there is speedlimiter= variable in the engine section of hdv, which enable and disable the speed limiter for the car, trouble is, I cannot find validation that there was or was not one in these cars in 1991
edit #2 - there was no speed limit in pits irl, but disabling speed limiter in the car, means you can drive what speed you like but unless custom made track with no pit speed limit is used, driver would get penalty for driving too fast on most of the tracks because is usually active in the tracks. As a result, the speed limiters will stay in this mod until such time that the pit limiter is selectable in the ui for the track, which is unlikely to happen tbh.