From the article:

>Our analysis here is a reminder that client ASN traffic volume is an unreliable proxy for interpreting automated bot behavior. Defending against automated threats requires inspecting request behavior, such as identifying shared JA4 fingerprints, monitoring anomalous request rates, and applying WAF rules to sensitive endpoints, regardless of which network the request originates from. Physical infrastructure is static, but malicious automation is built to move.

Of course they're tooting their own horn that you need their advanced features and expertise to block all the bots, but it's approximately true. At the very least it's hard to block purely on ASN without inflicting massive collateral damage on privacy conscious users (ie. using VPN), because baddies can (and do) use the same commercial VPNs.