This is really not 100% accurate. You will only actually validate (confirm) a transaction if you actually 'find' a block at which point you will most likely (depending on your, or your pool's policy on transactions) confirm several hundred (if not thousand) transactions.
If you do not find any blocks then you will not validate/confirm any transactions.
Your miners work for the pool, pool operator divided earned btc between pool participants=you did process transactions (as long as your pool got blocks).
It is difficult to argue otherwise.
Like it was said above unless your machine actually finds a block your miners are not actually validating any transactions. All of the work your miner puts into unsuccessfully trying to find a block does nothing to validate transactions.