How old is the car?
It's possible the people you bought the replacement turbo from back in 2019 might have sent a refurbished turbo rather than a new one, could be a simple mistake.
But the most likely cause of failure is the oil feed pipe to the turbo is part-blocked, which means the turbo bearing isn't getting the lubrication it needs. Was the oil feed pipework changed when the original turbo died back in 2019? If it wasn't, a repeat failure was inevitable.
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