Yes, but I can't find a reference to TCH on any of the in-flight material I have access to, like charts, legends and performance data. In the Canadian doc. you linked to it just says TCH may vary between 40 and 60 feet and is normally 50 but to consult NAV CANADA for the exact value... Something I'm not likely to do on 5-mile finals.
Having done a bit of digging around, it seems that there is disagreement in heaven about what actually constitutes a "threshold" anyway.
Practically, as a humble airframe driver, I'd like to know whether the runway I'm about to land on is long enough, given the prevailing conditions and my state of urgency. All I have to go on is LDA from the charts and LDR from 50' from the manuals, as approved by the regulatory authority.
As an aside, if LAX has these non-standard higher-than-usual TCHs, how come they get CAT II & III on those runways when that's a long way outside Annex 10 regs...?