Yes. It seems that the performance in Hildesheim on May 29, 1993 was one the last of the trio. Heading "Festivals" (Jazzpodium Nr. 5, May 1993, p. 56): "Jazztime Hildesheim '93. 29.-31. Mai, 1993, Hildesheim. Jimmy Giuffre, Paul Bley, Steve Swallow".
There is another date under the heading "On the road": "Jimmy Giuffre, 23.5. Essen" (JP No. 5, May 1993, p. 68). But under the heading "Jazz Clubs + Konzerte": "Essen. Grillo-Theater. 24.5. [sic] Jimmy Giuffre/Paul Bley/Steve Swallow" (JP Nr.5 May 1993, p.61). Same heading (JP Nr. 5 May 1993, 59): "Berlin ... Quasimodo ... 25.5. Jimmy Giuffre/Paul Bley/Steve Swallow".
Heading "On the road" (JP Nr. 6 June 1993, p. 59): "Jimmy Giuffre 6.6. Delmenhorst". But heading "Festivals" (JP Nr. 6 June 1993, p. 61): "Jazzfest Delmenhorst, 4.-6. Juni 1993, Delmenhorst. ... 6.6. Jimmy Giuffre/Paul Bley/Steve Swallow. Heading "Jazz Clubs + Konzerte" (JP Nr.6 June 1993, p. 70): "Hamburg, Fabrik ... 7.6. Steve Swallow/Paul Bley/Jimmy Giuffre [!]"
If I find more informations I will share it.
His Parkinson's disease is mentioned in the Wikipedia articles in English and German. But only the German Wikipedia article mentions that he ended his career as a musician in 1993.