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I'd note that the aluminum readings on my 2012 TDI were above the universal averages / high 20's until I passed 50,000 miles. At that point they dropped down into the low teens and have been reporting consistently since then.
Similar to yours, my flashpoint is running 405 F. It had been higher previously, but my driving patterns have been more short trips over the past year or so. As Blackstone has suggested to you, I think short trips may be influencing that reading.
Regarding their mention of TBN, after I completed the 30K dealer oil changes, I switched to using LiquiMoly TopTec 4200 and have had TBN readings consistently in the mid-2's on OCI's above 15K. Not suggesting there is a problem with your reading, but when the dealer did my two oil changes at 10 and 20K, both analyses came back similar to yours at around 1.7.