FWIW, I'm seeing the same thing. Have you tried this in Xenserver 8.0? That would help determine where the change in behavior occurred.
P.S. I imagine most people get this information from either XO or XCP-ng Center. 
Danp
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Posts made by Danp
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RE: XCP-ng 8.0.0 xsconsole doesn't show Host Performance Information nor VM's CPU and Memory Usageposted in Development
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RE: Number of cores in stats is incorrect for VMsposted in Xen Orchestra
How many cpus are displayed under the General tab?