Hey Tim,
Indeed the pricing page has changed and we are no longer offering this SLA on Medium plans. Existing Medium plan users will be grandfathered into this SLA Guarantee until the end of 2020 or the end of their current term (whichever one is longer). Any new Medium plan subscription will no longer benefit from this Uptime Guarantee.
For more details on this, you can check out this post.
Thanks,
Adrien