The whistleblower's summary of the White House official's account of the call largely comports with the call record released by the White House, though some details are missing.
My impression, from a comparison with the actual call transcript, is that the memo is very tendentious. It definitely cannot be said, without serious qualification to "comport with" the call transcript.
For example, the claim is made that the call was "completely lacking in substance related to national security." OK. Supposing that to be the case, must phone calls between heads of state always involve "national security?" Moreover, "national security" is susceptible of broad interpretation. Might not the integrity of our elections, especially when foreign money is involved, be a national security concern? I believe so.
The president is said to have asked Ukrainian authorities to "investigate his political rivals, chiefly former Vice President Biden and his son, Hunter." "Rivals" is plural, yet only one such rival is mentioned in the transcript: Joe Biden. Hunter Biden is not a political rival--just a sleaze. Further, the notion that political rivals of a president are somehow ipso facto immune from investigation is extraordinary--and stupid. But this characterization of the conversation is readily seen from the transcript to be tendentious in the extreme, to the point of outright misrepresentation.
The claim that Trump asked Zelenskyy to meet with Giuliani and that Zelenskyy "reluctantly agreed" is a clear falsehood. Zelenskyy introduced and repeately pushed the idea of talking to Giuliani. Also false is the claim that Zelenskyy "demurred ... to most of the president's requests."
The clear takeaway is that Sammy Two is unreliable as a source of actual information, and probably a liar.