The data sheet refers to operation up to 85C and typical up to 125C.
There are no part numbers for parts operating up to 125C
So far, catalogs only show parts rated to 85C.
Usually, higher temperature rated parts have a different postfix.
What is the designation for an E grade 125C part?
"The REF19x series references are specified over the extended industrial temperature range (−40°C to +85°C) with typical performance specifications over −40°C to +125°C for applications, such as automotive"
This paragraph in the datasheet only means that the min and max in the datasheet is tested and guaranteed when the part is subjected to temperature within the range of −40°C to +85°C. When using the part in temperature that exceeds 85°C, but not exceed 125°C or simply within -40°C to 125°C, the typical values indicated in the datasheet is guaranteed but not the min and max values.
All the part number indicated in the ordering guide can be used in 125°C with specs indicated in Page 12 of the datasheet.