It is truly incredible that these people have not only not read Marx, but also not read any Adam Smith or David Ricardo (even though they likely view Adam Smith as their 'more scientifically correct ancestor like Newton or Darwin'), so they have absolutely no conception that Marx is literally just expanding on both Smith and Ricardo's theories and works, testing their claims with newly available statistical economic data (that was collected because of initiatives by Smith and Ricardo but never actually followed up on because that is never how economic planning actually works in western democracies, nobody actually looks at real economic statistics outside of academia or bureaucratic functionaries, they simply publish them when they are in their favor) and expanding on their claims, taking them to their logical conclusions.

It's so infuriating to see them posit that something like the Labor Theory of Value is horseshit because it is from Marx when the Labor Theory of Value is not originally a Marxist claim, it is far older than that, but it was most explicitly a claim by Adam Smith that Marx then went to great lengths to provide evidence for and demonstrate how the value applied by labor affects commodity pricing of supply and demand based on it's 'usefulness'. AND THIS IS LITERALLY ON THE WIKIPEDIA PAGE 'LABOR THEORY OF VALUE'.

And that said, nowhere in Marx does he ever actually say 'Labor Theory of Value' because this is just his 'Theory of Value', which happens to center on labor because it is the only way that he was able to make sense of things like the gold inflationary crisis in Spain, or how cheap products from India could be priced despite their demand and distance (remember this is just prior to mass industrialization in Britain). From there he was able to extrapolate what was causing these events that contradicted a purely 'supply and demand' based system to create a model of exploitative economic relationships that actually run society, in direct contrast to the popular British utilitarian rhetoric at the time, which was about 'providing moral value (read now as jobs) to indolent and uncultured savages'.

As @GrouchyGrouse@hexbear.net pointed out, these neoliberals are quite literally the using the exact same appeal as those old British utilitarians, literally dressing up old unscientific and racist ideas in new clothing and attempting to pass them off as 'more modern' than Marxist economics.