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I wouldn't jump straight in with a holed piston, as while thats possible its not the only reason
I'd 1st suggest to do a compression test across all 4 cylinders as they should all be within 10-15 psi of each other as this will show if the engine is mechanically fine
Could also be an injector leaking fuel back through the overspill pipe, so not getting enough fuel pressure to tell ECU to fire the injectors, this is trickier to find and you’ll need the garage to do a ‘run back’ test to identify which one is the issue
and check all the high pressure hoses post turbo/s for any split hoses or cracked metal pipes, also check the ends of the intercooler as its not unheard of to pop the end caps off under high boost.
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