Hi,
1, the transcript and grammar needs to be checked, I agree, it's due to a bit of rush.
2, The 'pointing finger' is not because the correcltly noting db605 limitations, but the selective qouting of sources in order to show only the suckiest 109 tests.. Soviet, Finn, and Rechlin results being dismissed on made-up reasoning.
UPDATE
Messerschmitt AG. Augsburg - Leistungen Me 109 G mit DB 605 AS.
Versuchs-Bericht Nr. 109 20 L43.
January 1944.
(Factory performance trials with Bf 109G-5 WNr. 26 108, fitted with the new high-altitude DB 605 AS engine. In German.)