how would a data engineer call it testing the platform. The delivery is nowhere near his job description. It could be kind of reasoned for an app or web developer. Also what about the OPS team. Its is most likely not in his job description that was submitted to USCIS.

Also even if its was in job description, on H1b it would be considered an additional job and might need an additional H1b filling. Any active income will need to filed by the employer

This is my understanding.