It is not clear what you’re asking about here. Of course, you can ask for a recommendation letter from this person.
The real question here is if it is just a recommendation letter confirming eligibility criteria (part of 10 pieces of evidence) or is it one of three reference letters required as well? If it is the latter I am not sure that Senior IT Advisor would be able to provide strong enough evidence. You probably will need to think of securing references from CTO, VP/Director of Engineering or similar position.
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