That's a good question. Magnetic drain plug picks up particles that indicate something is drastically wrong. When it's a fine sludge and of such a small amount, that says the internal wear is doing well. Very similar to looking at a filter and seeing if it has metal particles in it. I haven't heard a magnetic plug changes the overall analysis.
In any case, my bike typically has higher aluminum due to clutch basket wear as it's over 91,000 Mi on the original clutch. That's what has been said by folks here on the forum.
Aluminum (clutch basket) won't show on the drain plug and there's no sign of it in the filter. Analysis is microscopic particles with respect to PPM of engine wear metals.
The bike doesn't burn a drop of oil over 5,000 Mi so there's no issue in my opinion with respect to pistons or engine internals.