Even if that were true--I happen to interpret Johnson as having cared about poor whites and to an extent poor Hispanics much more genuinely than about pretty much any other group to which he pandered, for what that's worth in the context of the War on Poverty--that's not what 'liberal technocrat' means.
I called him a technocrat because because of the new bureaucracies he created, but who am I kidding? We don't put scientists in charge of medicine, welfare sociology, or ag production. Those jobs are reserved for political hacks who are owed a favor.
LBJ sent uneducated poor people to 'Nam, and told his generals to fight according to presidential approval polls. If that's affection, I don't want to think about his wrath. He blocked Civil Rights when Ike was in office, too. I have a hard time believing that LBJ took America's downtrodden classes seriously.