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Yes, I believe this to be a typo.
Essentially, if the supply drops below 2.4V, then the operation of SPI_1 (pins shared with I2C, not available on the SIP module) is limited to 6 MHz.
I believe this typo took a while to find since most members here use the SIP module and cannot use SPIFFY1 on it (internal I2C/EEPROM already using),
Thanks! I was assuming so, but wanted to report it to you guys.