nah. loam is, for example, 40% sand, 20% clay, 40% silt and it's close to middle of that polygon, on top of letter O

for example, draw a line from 50% sand point on edge to 50% clay point on edge, the first one is 50% sand 50% silt because that axis for sand is also 0% for clay, the second one is 50% sand 50% clay because it lies at the line that is 0% silt

I think it makes more sense if you view it as fractions or ratios.

I.e. 50/150 parts sand, 20/150 parts clay, and 80/150 parts silt would be considered loam