Yes, you are correct. Good find. We would need to update the wiring map in FW to make sure the SPI pins line up, but that’s easy enough.
The 4 wire RTD requirement is definitely a miss. I suppose you could splice in your own 4 conductor wire right up to the sensor to make a 4-wire. That would work but would make waterproofing a bit harder.
They already responded back the next day with interest in granting the request on the next design, they verified that there is no snipping with the ground pad right under the pin... They asked a few other questions about the pin header and such, I said it looked fine ans we would likely be jumpering to panel connectors from it using a ribbon cable and leaving 1 wire unused... They also asked if we could use 4-wire, I responded with the fact that if you look on amazon/aliexpress/ebay/brewing supply sites, 99.9% are 3-wire and 4-wire are so hard to find...
A side note on making your own sensors.... the aliexpress RTD in my calibration experiment was easily 10x faster than my 1-wire sensor I made myself just stuffing it in the tube... I was actually shocked when I saw it.... it was nearly as fast as the glass 32-212 lab thermometer... I need to see if there is a high thermal conductivity adhesive I can put on the 1-wire sensor before shoving it in thermowell... the cheap RTD's are really going to up my game in the 2-3 spots I want to get quicker, more accurate temps...