You can access those properties via the ExtensionData property.
Get-VMHost |Select-Object -Property Name,Manufacturer,Model,ProcessorType,
@{Name="NumCpuPackages";Expression={$_.ExtensionData.hardware.CpuInfo.NumCpuPackages}},
@{Name="NumCpuCores";Expression={$_.ExtensionData.hardware.CpuInfo.NumCpuCores}},
CpuTotalMhz,CpuUsageMhz,MemoryTotalGB,MemoryUsageGB,Version,
@{N="BIOS version";E={$_.ExtensionData.Hardware.BiosInfo.BiosVersion}},
@{N="BIOS date";E={$_.ExtensionData.Hardware.BiosInfo.releaseDate}} |
Export-Csv -Path VMHostInfo.csv -NoTypeInformation -UseCulture