The two people are Dr. Erhard Wetzel and Hinrich Lohse. The letter is generally described as a draft and appears to have never been sent. Wetzel managed to avoid prosecution and died in 1975. Apparently they didn't start investigating him until the 60s but nothing ever came of it.
Samuel Crowell did a fair bit of work on this document (see page 308 of his book). The original orthodox interpretation was that the
Vergasungsapparate referred to were
stationary homicidal gas chambers. However, seeing as it is not alleged that there were stationary gas chambers
in Riga, they later changed this to gas vans (rather arbitrarily) which are said to have operated in the east.
Crowell suggests the phrase
der erforderlichen Unterkünfte sowie der Vergasungsapparate should be translated “the necessary buildings as well as the fumigation vaults.” The Nuremberg translation has "the necessary shelters as well as the gassing apparatus." Crowell produces examples demonstrating that
Vergasungsapparate was in fact used in a fumigation context. In contrast, "we're going to send you the shelters and gas vans" seems strained.
In support of this interpretation, there is documentary evidence that the Tesch company sent men to Riga in the fall of 1941 to train people to do fumigations.
Evidence can be found in the transcripts of the Tesch-Weinbacher trial that show that Tesch employees went to Riga in the fall of 1941 to instruct people on how to use Zyklon B for disinfection; the discovery, by the British historian David Irving, of an Enigma decode in the PRO files that confirmed the visit by Tesch personnel to Riga; and a cache of correspondence between Tesch and Riga over quantities of Zyklon and how it was to be used. (This latter cache was misunderstood by Raul Hilberg and led him to make the erroneous assertion about the existence of later grades of Zyklon D, E, and F.) (Crowell, 311)
See also:
https://codoh.com/library/document/aspe ... sch-trial/
Crowell also notes that Orthodox historian Christian Gerlach, in an article about Eichmann, makes the curious comment in a footnote that the meeting between Wetzel, Brack, and Eichmann "probably never took place" which, in Crowell's view, would imply that NO-365 is a forgery (along with the related documents NO-997 and NO-998). If it was forged, presumably they had Wetzel write it up after the war in exchange for some sort of immunity (which he got). Whether an authentic 1941 document or a postwar fake (with Wetzel's cooperation) at least some of the draft letter is based in fact since we've already noted that the Zyklon B fumigation chambers are corroborated by the Tesch visits.
There is also the matter of the reference to "doing away with those Jews who are not able to work, with the Brack remedy." The most natural reading is that this is a reference to euthanizing Jews unfit for labor. The word
beseitigt (translated "doing away," from beseitigen - to remove)
could be interpreted more mildly, but seeing as Brack was involved with the euthanasia program, that suggestion is rather strained. The orthodox interpretation assume that the "Brack remedy" and the Vergasungsapparate are one and the same; however, these phrases are in different paragraphs. That is an assumption they are making.
A few mysteries remain about this document, but imo the Tesch visits strongly point to a fumigation interpretation of the gassing apparatus.