Political Memes

That Stanford paper you brought up uses an example from 70 years ago,

The Standford paper explains the development of the historical debate of the issue.

when Liberal was a moniker chosen by Laissez-Faire Market and Anti-Tax proponents who today would align with what is referred to as Libertarian.

This framing is proof that you don't understand where liberalism comes from. What were liberals defending in 1800, in 1850, in 1900, in 1950?

As for the examples you ask for:

Trudeau Liberals vote to allow for-profit health care system, NDP blasts flip-flop

(Article in Spanish) The origins of the healthcare collapse: the cuts of CiU and the tri-party ; Note: Catalan politics have long consisted a competition between liberal, socialdemocratic and left-wing parties, where the liberal ones have always incentivized private companies over public services, with the support of minoritarian Conservative parties.

In Germany, founders of private hospital companies are bankrolling the pro-business party FDP: FDP is the liberal party in Germany (with conservative parties to their right and socialdemocratic, left-leaning and green parties to their left). At the bottom of the article:

There is little doubt that the positions of the FDP on healthcare could be shared by the businessmen who built their fortune on private for-profit clinics. In its electoral platform, the party says: “We reject unequal treatment of private, public and non-profit hospitals operators just as strongly as we reject a planning sovereignty of the health insurance funds for health care structures”. That means that the FDP thinks that private hospitals should, for example, get the same amount of public investment than public and non-profit hospitals.

Which is ultimately a form of corrupting the basis of a public healthcare system, making people think they will receive worse care if they won't pay for private services and pushing the public system towards its collapse.

Present some examples, I’ve never met self-identified liberals who oppose public healthcare or housing

Yeah, no shit? The average voter in the US doesn't understand the difference between liberalism, socialdemocracy and socialism, so they'll call themselves liberals even if they don't understand the nuances of the term, while the average Democratic politician understands that they shouldn't express opposition to public policies that poll well with voters, even if they certainly don't intend to promote them. Because they barely have any politicians competing against them from their left, they aren't exposed not defending an actual public option.