Site wide SEO 'score' affected by orphan page quality?

I have a Shopify website. The product pages have an FAQs section, and those FAQs are separate Shopify pages (even though no one views them as a page and not linked from anywhere), so they are automatically listed in sitemap.xml.

If these FAQs page have titles and descriptions that are too long/short, does that have a negative effect on my website SEO? I don't want these pages to rank but does Google see it as a sign the website as a whole is lower quality than it would otherwise be? If so, how much of a factor could it be?