No, the SRD agrees with me. I used "X" instead of CR for that reason, and that it would mesh better with the description of 4e.
Let me phrase it another way - if you take the "complicated" system from 3e, and convert the appropriate monster CR into it's experience value, and then treat that Exp value as the "budget" for the encounter, you will get the same number of monsters as you would if you broke, say, a CR 9 encounter into a CR 7, a CR 5 and two CR 3s. It's the same math. (Apparently 4e uses half-steps.)