It may depend on denaturing agents as well as the particular acrylic grade.
Personally I wouldn't hesitate to clean acrylic with denatured ethanol, since I have never observed this, but you are not the only one saying it has this effect.
You are right about the MSDS changing, I fully expect with the new US administration even cyanide will be certified safe for use as a food additive.
Also watch out where you expose yourself to those chemicals, some are apparently only dangerous if you are in the state of California. ;-)
To return to reality, as others have mentioned it is a good idea to look at several different MSDS. They change as scientific understanding of the health effects changes.
ST