This logic makes no sense, the plate test is dependent on ambient lighting but the computerized test is dependent on a calibrated monitor. I’ve been doing digital photography and retouching for decades and a calibrated monitor is crucial for accurate color reproduction, let alone assessing someone’s vision in a way that could make or break their career!
Further, you can’t trust the FSDO to do a SODA test correctly. A younger me was naive and didn’t know that, I may be a commercial pilot today if it weren’t for that fact. At 18, I didn’t bother to look at the regulations for the procedure until after it all happened, but the person who administered the daytime signal light test I failed did not follow procedure at all, and I’m confident that I would have passed if it weren’t for how badly it was performed. I passed the night time test easily.