I don't think you can just multiply them both by 20. The author was focusing on cyclists very close to their ideal weight.
It doesn't matter how you slice it, saving one pound of bike or body weight will not yield the same gains as an extra 3W of power. You can confirm this for yourself on any of the readily available bike power calculators.
There seems to be a difference of opinion on this. If you use the online power calculators, on a 6% grade, one pound loss = 1 watt saved . . . about, depending on rider weight, etc. On an 18% grade, it's about 2 watts saved/pound lost. If you believe that, you're much better off focusing on maximizing your power at LT than on weight loss, if you're anywhere in the weight ballpark. However, if you've maxed your power, then weight loss is the only thing that helps.
OTOH, Carmichael estimated that Lance saved about 1 minute/kg lost on the Arcalis climb, stage 7. The bike calculators give a result of about half of that. My experience is that it's closer to Carmichael's estimate, though I don't have power figures to base that on. It just feels like body weight loss makes more than a 1w/lb. difference. But maybe there's more to it than just weight, like it was lead or something. Maybe the leaner body is more efficient, especially out of the saddle, and maybe a leaner body is also more aerobically efficient.
Pretty hard to study this, because losing body weight will probably affect power output and endurance, so lots of loose variables.
I believe the online calculators are correct as regards the watts saved by losing bike weight. I'm just not so sure about body weight.