His current UOA is consecutive from the last one. Yet, his Sodium level is up by almost 30ppm, and we know Mobil 1 does not have sodium in it. So I do not think this is from previous fill.
I do know that for some reason, it takes several fills/drains to get the sodium level to come down after using an oil with sodium as an additive, but no way would I expect it to increase from a previous UOA using an oil with no Sodium as an additive.