That entry that Lenin wrote in 1914 for a Swiss Encyclopaedia that Lih refers to is quite good and does back up his view that up until 1917 Lenin was a more or less orthodox leftwing Social Democrat and one who did understand what Marx was on about. It can be found here:
https://www.marxists.org/archive/lenin/works/1914/granat/index.htm
After 1917 of course he went off in a different direction, repudiating political democracy and defending a one-party dictatorship and so ceasing to be a Social Democrat.
Ironically, just like some other pre-war Social Democrats, in the end he found himself the prime minister in a government that could not bring about socialism and so had to accept capitalism and its economic laws, in his case to actually encourage the development of capitalism. Which is what the Bolshevik government did when had to adopt a New Economic Policy in 1921 which he himself described as “state capitalism” in the sense of the development of capitalism under the control of a “proletarian state” (ie a Leftwing government).