If you are carrying 20% body weight, add an additional 10TSS. If you want to add that/hour or per 1,000ft, that is up to you. I differ from that article, and I am pretty sure CP does too. I count the weight once rather than per/1,000ft, as the article says. So if you are going out for a 2hrs hike with 20% body weight and 2,000ft elevation gain, I would add 20TSS for the weight and 20TSS for the vertical. The time is accounted for based on your hrTSS, so the longer you go, the higher the number is that you add on to. For a 4hr hike with 20% body weight and 4,000vertical ft. I would add 60TSS to hrTSS. 20TSS for the weight and 40TSS for the vert.
Make sense? Either way works, just depends on how you want to do it 🙂