Those were the only two prices reduced outright, but the base CP and IS earned per fight is based on EXP earned, so when they increased the EXP yield per monster they also increased CP and IS yield. On top of that, the IS and AN yield from Besieged and Campaign Battles*, respectively, were also (I believe) increased. The actual prices didn't go down, but the resulting inflation pushed the value of the points down, keeping it more or less equal to the real value of the gear the points purchase.
Assault Points, in contrast, never really got that kind of inflation: it's a bit easier to complete an Assault at 99 (except Lebros Supplies...), but we get no more Assault Points per Assault than we did when Treasures of Aht Urhgan was released, nor can we do Assaults any more frequently. So while the real value of Assault Points gear went down as we all went to level 99, the (value of the) prices did not.
* The rewards from Campaign Ops could probably stand to see a similar increase. I can't think of any "endgame" activities that doing so would "break."


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