You can't walk across the floor without using strength - anyone who has a relative in the late stages of cancer knows this.
Kano's philosophy in judo wasn't to use no strength, it was to use what strength you had with maximum efficiency. A bit after Kano died Mifune took over the Kodokan (home of judo in Japan), and started to teach a philosophy of using minimal strength. Very idealistic, but competition judo is still based on Kano, not Mifune, for the obvious reason that you need strength to do anything, so use whatever you have - just use it efficiently.
Technique tends to work as a multiplier - it can double or triple your effective strength. But if you have almost no strength, it makes less difference than you think; three times almost nothing is still almost nothing. Think of a lever; using one can double what you lift, but if the next guy can lift three times as much as you, he'll still lift more than you can with a lever.
And anyone who thinks anyone winning medals in Olympic judo doesn't have phenomenal technique is fooling themselves. Throws don't look clean at that level because everyone is very, very good at both offense and defense. Do some randori with an Olympic judoka and, unless you're near that level yourself, you'll find that suddenly they can pull off very clean techniques. Everyone at the Olympics is very athletic, there's only a few percentage points of distinction in strength and speed between them (you see this in timed events - the difference between first and last in the 100 m sprint is typically less than 5%, and often less than 1%). The ones winning at level are the ones with the best technique.
Its like looking at a top level baseball pitcher striking out batters, and thinking that batters in major league baseball have lousy technique. Put them in your recreational league and you'll see just how good their technique really is.