Voynich’s Viennese Agency

[Anton]

Anton:

Sliwinski is mentioned in papers around the time, but I can't find where  they would be mentioned together with Stapinski.

From the link I gave above:
Związek Chłopski został odtworzony You are not allowed to view links. Register or Login to view. You are not allowed to view links. Register or Login to view. jako organizacja prosanacyjna. Funkcjonował w tej formule do czasu utworzenia You are not allowed to view links. Register or Login to view. You are not allowed to view links. Register or Login to view. „grupy chłopskiej” wewnątrz You are not allowed to view links. Register or Login to view., którego stał się częścią i zakończył swoją działalność. W tym czasie głównymi działaczami ZCh byli: You are not allowed to view links. Register or Login to view. (prezes), Józef Kaźmierczak, You are not allowed to view links. Register or Login to view..

Both are mentioned as activists of the same organisation Związek Chłopski (ZCh). It was later, but it doesn't mean that they hadn't political and ideological connections earlier.
Of course, it is in the case, if the second surname is Stapinski. I'm not sure about this, too.

What I mean is that they are not mentioned together in October 1912 newspapers. Either the author of the letter means some other papers (non-Austrian) - which would be strange, as they hardly would have descended to such local details as speeches in Lemberg - or the reference to the newspapers is just a covert trick to let Voynich have some important news about the two people mentioned. In this view, "have been speaking" might mean not delivering a speech, but something altoghether different.