as he said, it was for intermediate trends, not for the major trend
I think you may have flipped that around a tad.
"I repeat that the formula {The Livermore Market Key} does not provide points whereby you can make additional trades, with assurance, on intermediate fluctuations which occur during a major move.
The intent is to catch the major moves, to indicate the beginning and end of movements of
importance." Livermore's emphasis, not mine.
I love Livermore. He left behind many extraordinary lessons about how to operate in the stock market, as well as important lessons on how not to operate.
However, I find that all I really need is a weekly chart with volume data, and I do extremely well, not only getting into the main moves, long and short, but also finding points where I can make additional trades, with assurance, on the intermediate fluctuations.
I do not pretend to understand how to implement The Livermore Market Key. Whenever I get about 15 minutes into trying to spreadsheet a stock in accordance with Livermore's instructions, I look at the weekly chart and realize I have all I need right there.