They do state it. And if you try to install Turbo Tax on an old system it won't let you and tell you that you need to update your system. That is different than the current Mac problem. Did you read that link he posted?
System Requirements:
Window System Requirements
https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...
Mac System Requirements
https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...
