That information is not correct. I have a grandfathered package, and I'm currently getting a $10/month base package discount and several other discounts.
No it's not incorrect. Late last year, almost all grandfathered packages became ineligible for discounts over 5 dollars. The only package that qualifies now is Choice Xtra Classic. If you received discounts before that time, you maintain them. You will be urged to update your package in the future if you continue looking for discounts.