How many of those hours are relevant to the skills required in this case?
You are missing the point.
A senior captain with that much experience and presumably access to a whole library of company and Boeng manuals is not likely to need a homebuilt flight sim to find out how to switch off, or disable various functions.
Yes, the police should investigate everything, but with limited resources they need to prioritise the most likely areas first.
A flight sim in the captain's home and discussed on a number of enthusiast forums and YouTube is not really that suspicious.