Unfortunately whoever put "Attainable Rate (Kbps): The sync rate you would obtain"
where you found it is wrong when it comes to FTTC/VDSL2. I think it's a reasonable thing to say on ADSLx.
The "Rate" line is your sync, and directly gives the IP Profile of 17.42Mbps. IP Profile = Rate x 0.9679 on lines that don't have G.INP active, and Rate x 0.9669 on lines that do. Yours clearly doesn't have G.INP active.
If you have been checked a few times, as your OP implies, I would expect the Attainable to vary a little each time you look, but the Rate would only change on a re-sync.
However even on FTTC, rate and Attainable can be similar. My rate is normally a little higher that attainable - many other people see the same. I'll just get mine ...
Max: Upstream rate = 13866 Kbps, Downstream rate = 57900 Kbps
Bearer: 0, Upstream rate = 14372 Kbps, Downstream rate = 59999 Kbps
The big difference in yours will be down to either Interleaving being on, or the sync having been capped by the DLM for some reason. I suspect capping, just as I suspect mine is, but just at the moment don't have the table of capping speeds available.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
My broadband basic info/help site - www.robertos.me.uk.
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Connection - AAISP Home::1 80/20. Sync 59999/14372kbps @ 600m. - BQM