weird... or the field is weird. Try adding a new text field to the table and do a simple field calculate, python parser eg your new field would equal
!Condsize!
if that doesn't work try a couple of other variants like
val = str(row[0]).replace("\\", "_")
print(val)
I just want to check to see if it can be converted to pure text and replacing the backslashes with underscores or not.
Best check is get on an ArcGIS Pro machine and try it with python 3.7. python 2.7 is done as is the arcmap series (although it will remain on support for the foreseeable future.
It doesn't appear that the unicode or raw encoding worked for you (?!) but again, you are using python 2.7
... sort of retired...