I don’t agree with this. I personally think that it’s better to keep them on the same day to maximize rest the following day. There is good information in the Strength Training thread on the topic. Here is a passage from @chad which you can find near the top:
As far as scheduling your strength workouts so as not to negatively impact your endurance training, our recommendation is to separate them as much as possible but do them in the same day rather than schedule strength work on a recovery day.
Everybody responds differently to training stress, so you have to do what works best for you however.