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Oil pressure sensor

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Hi Gents, could you please tell me what to do.
I changed the oil pump with its O-ring, also the oil pressure sensor and still showing this code P0521

Vehicle: Trailblazer 2007, 5.3 8Cyl 4x4

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see service bulletin on link below, the "Valve Lifter Oil Filter" might be clogged

https://www.autocodes.com/p0521_chevrolet.html

https://www.autocodes.com/uploads/gmc/11-03-07-144538.pdf

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