Sentence:  Accordingly, even though readers always and understandably speak of the theories <WSD>adumbrated</WSD> by Socrates here as "Plato's theories", one ought not to speak of them so without some compunction--the writing itself, and also Plato the author, present these always in a spirit of open-ended  exploration, and sometimes there are contextual clues indicating that Socrates exaggerates or goes what the argument truly justifies, and so on. 
Meaning of the word marked with <WSD> tags:  To give a vague outline.