It appears you're partly right. The OED requires two cross-links to find a definition, and both have additional meanings and links, making it quite confusing. After reading them three times, I get that definition.
However, the cross-link from "pommes frites" goes to "potato chip" which is defined as both "chip"and North America "potato crisp." So I think "pommes frites" is being defined as both.
>> The OED says that pommes frites are potato chips; the AHD doesn't have it.
> But isn't this merely the OED's British usage, where "French fries"
> chips" are there called "crisps".
>> and can be used to refer to Mickey D's dish only in a joking way.
>> The spelling of the singular is not yet fixed. I think "pomme frite"
>> frites" are also found on Google.
>> double take and take a second to figure it out."