Setting aside the way that you have framed your question (which is some crazy conspiracy theory) this seems to be a garbled paraphrase of a passage in Lenin's 1917 pamphlet "Will the Bolsheviks Retain State Power?" In full, in English translation, the passage reads:

Capitalism has created an accounting apparatus in the shape of the banks, syndicates, postal service, consumers' societies, and office employees' unions. Without big banks socialism would be impossible. The big banks are the "state apparatus" which we need to bring about socialism, and which we take ready-made from capitalism; our task here is merely to lop off what capitalistically mutilates this excellent apparatus, to make it even bigger, even more democratic, even more comprehensive. Quantity will be transformed into quality. A single State Bank, the biggest of the big, with branches in every rural district, in every factory, will constitute as much as nine-tenths of the socialist apparatus. This will be country wide book-keeping, country-wide accounting of the production and distribution of goods, this will be, so to speak, some thing in the nature of the skeleton of socialist society. We can "lay hold of" and "set in motion" this "state apparatus" (which is not fully a state apparatus under capitalism, but which will be so with us, under socialism) at one stroke, by a single decree, because the actual work of book-keeping, control, registering, accounting and counting is performed by employees, the majority of whom themselves lead a proletarian or semi-proletarian existence.

So here Lenin is proposing seizing already existing large banks and converting them into an institution that will comprise up to 90% of the institutional power structure of the new socialist state, rather than saying that the preexistence of such banks is 90% of what is needed to achieve socialism. The banks are here identified as capitalist institutions to be seized during a proletariat revolution, rather than contributing to socialism in any manner while they remain under capitalist control (which is how I would interpret the garbled quote you have supplied.)

This is from a 1972 translation of this pamphlet available at https://www.marxists.org/archive/lenin/works/1917/oct/01.htm ; a more contemporary English translation from 1921 with slightly modified language can be viewed here. https://www.google.com/url?q=http://collections.mun.ca/PDFs/radical/WilltheBolsheviksRetainStatePower.pdf&sa=U&ved=2ahUKEwjRzY2VwpDpAhWEmHIEHagZBA8QFjABegQIARAB&usg=AOvVaw2eJT2VddF6XTF_35OqH1Iu