Ben Johnson Squat 1rm?

Does this suggest sprinters, who I think would like to be fast twitch dominant, should use higher loads (i.e.85% and above)?

However - according to this article, SE is not shown/neglected/not trainable or all of the above? Ie - If bens squats were 6 x 600lb and 85% of max = Slow twitch dominant…
I think it is mixing apples and orange to suggest Ben is slow twitch. FT effect on this measurement could be overcome by very high level of SE, as Charlie suggested. I’m not sure Polequin’s cuttoff took into account athletes with such a high level of endurance.