MSA2040 volume expansion is block level activity and this is online process. No need to stop Host IO. The same volume already presented to ESX Host but here question is VMFS filesystem extend for the datastore.
I don't think file system extend automatically possible. Please find the VMWare ESX6.7 process to extend VMFS file system,
The article you have shared seems completely different activity "Recreating a missing VMFS datastore partition in VMware vSphere 5.x and 6.x (2046610)"
Hope this helps!
Regards
Subhajit
I am an HPE employee
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