What fluid did he use, it looks like Mercon V is recommended and that fluid has been around since the mid 90's. It's definitely not a new or modern fluid.
Almost every manufacturer has their own fluid spec, there are even OEM's that use the same transmissions as other OEM's and they will have different fluid specs between them. I'm not saying all fluids are the same but most are not very different at all, at least if he used a modern spec fluid. The biggest changes in modern fluid specs was going to a synthetic, or blend for longevity and viscosity , friction modifiers are another change. If he dropped the pan and changed the filter he only changed less than 1/2 of the total fluid out anyway.
So if his concern is shift quality/feel (soft/hard ) or shudder during torque converter engagement, it's possible the fluid is causing that, but with only changing 1/2 the fluid I doubt any harm has taken place because of the fluid. Tell him to change it again to the proper fluid but depending on symptoms, it might have other concerns (maybe the reason he changed it in the first place?)
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