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The ping v1 happens when the ping v2 fails, however, it causes the ping v2 error to be skipped and not output to the user. As result, when a registry has v1 and v2 enabled, and there are, for example, intermittent connectivity issues making the ping v2 fail, the user is presented with a misleading error saying "can't talk to V1 registry."
Since the only use of v1 is for the search API as a workaround for docker.io, and new container registries setups are very unlikely to be v1-only, there is little utility in keeping this v1 detection in the attempt to help the user realize their setup is v1-only, hence not compatible. On the contratry, it just presents the user with a misleading error in certain circumstances.