How is it that Cisco claims a routed Access layer provides 4x faster convergence than RSTP?

From this design guide:

https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/routed-ex.html#wp998203

“Of these, perhaps the most significant is the improvement in network convergence times possible when using a routed access design configured with EIGRP or OSPF as the routing protocol. Comparing the convergence times for an optimal Layer 2 access design (either with a spanning tree loop or without a loop) against that of the Layer 3 access design, you can obtain a four-fold improvement in convergence times, from 800-900msec for the Layer 2 design to less than 200 msec for the Layer 3 access. (See Figure 4.)”

In RSTP (802.1w) access networks Ive commissioned in the past, i have solid evidence demonstrating sub 30ms convergence times in most cases both for link and switch failures. Am I crazy? Is OSPF/BGP really faster? Even with BFD you usually dont get below 150ms, right? Anyone have a verifiable white paper on the topic comparing the two?