According to the plans page, Free and Pro customers get this kind of DDoS protection:
Basic DDoS protection. Cloudflare’s basic DDoS protection allows legitimate traffic to reach your website, while stopping illegitimate traffic at the edge, before it hits your server. Basic DDoS protection is limited in our Free and Pro plans, and based on the attack’s disturbance to our network.
Business and Enterprise customers get:
Advanced DDoS protection - Layers 3 and 4. Cloudflare automatically stops TCP SYN, UDP and ICMP attacks at the edge so they never reach your origin server.
Advanced DDoS protection - Layer 7. Automatically detects sudden changes in traffic and protects against layer 7 DDoS attacks, such as POST floods and DNS-based attacks, so they never reach your origin server.
Advanced DDoS support. Backed by a full SLA, our DDoS experts will keep you online 24/7/365 no matter the size, type, or duration of the attack.
With Enterprise customers also getting:
- Sustained speeds via dedicated IP ranges
- Emergency support engineer
The DDos page you’re referring to seems to be with features for Business and Enterprise customers, judging from the text and described use cases.
Hope this helps!