Roberts mostly focuses on Squadron, so Squadron should still inform everything else lore wise. And if you play the current Star Citizen alpha, there's very little lore regarding the event Squadron 42 is about. There are no Vanduul in Star Citizen yet, or any other alien races for that matter. The final planet in the Stanton system and the two neighboring star systems they're currently working on aren't going to change that, they are all in human space. They deliberately keep everything regarding the Vanduul or Earth politics to a minimum. The only mention of the war I remember is an inscription at the Hurston Dynamics HQ in Lorville. They're also holding back assets that are shared between both games but play an important role in Squadron 42.
That said, the technology Foundry 42 Frankfurt developed for Star Citizen absolutely informed the gameplay in Squadron 42 I believe. But it's also worth keeping in mind that most of the devs are working on Squadron 42 primarily or exclusively. The core technology group is shared between both games of course, and spread across all studios, But only two of the six studios, CIG Austin and Turbulent Montreal, are primarily dedicated to Star Citizen, and Austin mostly does backend and server stuff while Montreal only just opened.