My PD mentioned those oil rubs don’t actually get rid of the gas, but it only provided warming sensation which then distract babies from the discomfort caused by gas.
For my case, baby’s stomach was bloated and hard as you mentioned. Also baby was extremely fussy and cry a lot, when she cries her body is stiff and face very red. Was prescribed colic drop (Ridwind) by PD, didn’t help much but eventually my baby seem to outgrow it by 2+ months old.