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What I think happened is the following.
The chkconfig --list command shows the persistent status of the service.
The /etc/init.d/slpd status shows the current status.

The code should in fact list the 2 options, current status and the persistent config.

Something like this

$user = 'root'
$pswd = 'VMware1!'

$cmdsub1 = @'
/etc/init.d/slpd status;
'@
$cmdsub2 = @'
chkconfig --list | grep slpd;
'@

$secPswd = ConvertTo-SecureString -String $pswd -AsPlainText -Force
$cred = New-Object System.Management.Automation.PSCredential ($user, $secPswd)

Get-VMHost -PipelineVariable esx |
ForEach-Object -Process {
    Get-VMHostService -VMHost $esx | Where-Object { $_.Key -eq 'TSM-SSH' } | Start-VMHostService -Confirm:$false | Out-Null

    $session = New-SSHSession -ComputerName $esx.Name -Credential $cred -AcceptKey

    $current = Invoke-SSHCommand -SSHSession $session -Command $cmdSub1
    $persistent = Invoke-SSHCommand -SSHSession $session -Command $cmdSub2
    New-Object -TypeName PSObject -Property ([ordered]@{
        VMHost = $esx.Name
        Current = $current.Output[0]
        Persistent = $persistent.Output[0]
    })

    Remove-SSHSession -SSHSession $session | Out-Null

    Get-VMHostService -VMHost $esx | Where-Object { $_.Key -eq 'TSM-SSH' } | Stop-VMHostService -Confirm:$false | Out-Null
}

To stop the service and change the persistent setting, the original thread I pointed to does that