Earlier quoted context omitted.
https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CEL...
I do not read this court decision like that at all: the point of contention there seems to be that the customer was just sent a link to a webpage (where the contractual terms can be changed from under him at will by the company, thus this not being durable). The court makes it pretty clear in my (non-lawyer) opinion that attaching a PDF to the email would have been fine.
Even the (*-grand)parent never said the law actually says it can't be an email attachment, they said companies seem to interpret it that way. Which would not be surprising in the least. Then someone said they've never heard of any such law, and I pointed out that it exists.
I'm not sure who you're arguing with but it isn't me or in fact any of the people in this thread.