Does the tax treatment change if you exercise > 90 days after leaving? From what I understand, options may be treated as NQSOs rather than ISOs if exercised >9

Does the tax treatment change if you exercise > 90 days after leaving? From what I understand, options may be treated as NQSOs rather than ISOs if exercised >90 days after the employee leaves. (source: http://blog.samaltman.com/employee-equity http://blog.samaltman.com/employee-equity)