Hmm… yeah I can confirm the same thing happening. Manually installing Quip fixes the problem as a workaround. Interestingly, changing the resolver to get Quip 2.3.3 works - it just can’t find 2.3.5. 
Added this info to an issue: Articles cannot find Quip 2.3.5 on install · Issue #161 · modxcms/Articles · GitHub