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Mori was on /a/ and /jp/ 7-10 years ago. Most likely doesnt browse forechan anymore since 2015-16, like most sensible people.
Ina and Kiara have used oekakis in the past. /i/ boards on 4chan are one of the oldest "stable community" western oekakis, so there's a possibility that they've used them in the past. However they're also extremely low quality compared to other places for a variety of reasons, so chances are they used something else, especially Ina. Besides this, they wouldnt admit on stream to using oekakis if they though they were primarily a 4chan thing, or strongly associated with 4chan in any way.
Gura and Ame know *of* 4chan, but probably dont come here. Gura's humor comes from twitter/instagram meme culture, she particularly liked davinki from last year's batch.
The narrative that Ame browsed 4chan, reddit and most big discords religiously for the first month or so because she wanted the most varied feedback is valid, but I dont think she enjoys neither the culture nor the absolute lack of quality of /hlgg/.
