I've been experiencing exactly the same thing over a number of sites for the last few days too, with exactly the same user agent in this post. The annoying part is that it is not really 'spidering' web sites, but rather continuously hammering a list of non-existent pages which appear to be from a years-old version of the site.

Generating 404 responses puts a considerable load on WordPress sites and generates a lot of network traffic, but these have been relatively easy to block because of the predictable user agent and URI path prefixes. I'm thinking about blocking the Azure ASN completely, or developing something akin to Cloudflare's "are you a human?" interstitial page when requests come from cloud provider ASNs.