Don't know for which technical domain he demands open access to ISO standard texts (because many ISO standards, in fact, can be freely accessed [1] while others are accessible as pre-final, nearly identical versions), but I'm guessing ISO being essentially a complicated joint org of national standardization bodies, changing treaties and getting member votes etc. would be a difficult thing to do at this point. There's also the issue of spec editors selling copies of books containing spec text with commentary for financial compensation of their work.

[1]: https://standards.iso.org/ittf/PubliclyAvailableStandards/in...