No. If you are using any of the bigger community fixes (CM, EE or PFP), this is fixed and CAs in a combo correctly use their relevant speed. My High Elf has 68% attack speed, yet still casts combos at the 150% execution speed cap. You can easily check in game by hovering over the selected combo on the inventory page:
This screen shows info about the normal weapon attack:
And this screen shows info about the selected combo (Frost Flare + Raging Nimbus in this case):
If you combine multiple aspects for which you have different execution speeds, each CA in the combo will get executed with its appropriate speed, as if you cast them manually in sequence, one by one.
In general, any CA, be it alone or on a combo, has its speed determined by execution speed. Attack Speed only ever matters for basic, non CA attacks. However, there is one special case: for Weapon based CAs - the Attack Speed from the relevant Weapon Lore also doubles as execution speed for these CAs. But any Attack Speed on gear and such will only ever increase non-CA attack speed.
The wiki refers to the vanilla state of the game, 99% of the time, unless it specifically mentions something relates only to a specific community mod/patch. Pretty much every major bug the wiki might mention is fixed in most community releases.