Yes the numbers I mention are correct, but they apply only to the transfer of Membership Reward/Diner Club points to Hilton Honors.

For example I have a Diners Club card which gives me 2 points for every dollar charged to the card. Ordinarily this gives me effectively 2 Hilton points if I decide to convert the Club reward points to Hilton Honors. (Note - I have never converted my Club reward points to hotels points, I have used them exclusively for conversion to airline miles).

Similarly if one had 5000 Membership Reward points and wanted to convert those points to the Hilton program, one could ask American Express to do so and would get 6500 Hilton points (or 7800 points during an AMEX "promotion"). However one could do better by converting those Membership Reward points to 5000 Continental airline miles, and then ask Continental to convert them to 10,000 Hilton points.