The note is cerified by BCS. Have not they said they do not certify these errors?
This is what BCS had to say about error notes not too long ago (under their FAQ section):
2. Will my error note receive appropriate certification?
Error notes will not be certified. The variation in error notes is too broad and open to interpretation.
This is what BCS says about error notes today in the same section:
2. Will my error note receive appropriate certification?
Your note will receive a error recognition under the comments section for a limited number of error types. BCS reserves the right to not recognize any type of error.
I don't know whether the note mentioned in this post was certified after the change or before. This much I know for sure that there was a note from a well known and established
e-bay seller which was also certified by BCS and that was put up for sale on e-bay when BCS was saying that "error notes will not be certified"