I don't think they are uniformly distributed. Anecdotally, in my friend's backyard, the ratios I found were more like

    10000 three-leaf
    15 four-leaf
    7 five-leaf
    4 six-leaf
    2 seven-leaf

I would assume that the ratios in any given area can be quite different than another area.

This. The distribution varies greatly. Just like some patches have more 4 leaf clovers than other patches.

So 2:1 for four-leaf:five-leaf?

Seems to reinforce their point that this blog is bs

my point is that the ratios are variable, and thus 100:1 four-leaf:five-leaf is plausible

It's hard to see it being off by multiple orders of magnitude.

The link suggests that we expect to see 100:1 four-leaf to six-leaf ratio, but in that one patch I found about a 4:1 ratio. I think it is very plausible that different lineages and/or different environmental conditions could cause wildly varying numbers.