I know Ms. ATP teacher mentioned he isn't finishing assignments in her class but at least some of the problem may be that there isn't a scribe or aid there to help him and there are no computers so sending the unfinished work home may be a good idea.
If there is scribe or aide mandated in the IEP, and they're not providing one, that's a problem to discuss at a team meeting, not in an email with a different teacher, IMO.
As I was filing away Ds's progress report from this year I compared it with his one from last year. He had all PHs and Ss last year.