What he is trying to say is if your frount subframe mounts are old you run the risk of tearing them by putting the car on a pad style lift. Basically if you are driving a 40 year old car it might be a good idea to replace the mounts so you will not face this problem.
When I first bought my car I put it up with the engine running trying to find a transmission leak and the mounts were torn. Needless to say the racket of the fan hitting the shroud put a stop to that.