I think it's one of the best ways to get feedback on your marketing copy. If they don't bother clicking on your website from your PH page, they won't convert anytime soon in the future.
So be sure that your marketing copy is crystal clear. Not clever.
Yes, Product Hunt can be a valuable platform for launching a B2B SaaS, offering exposure to a tech-savvy audience and opportunities for feedback and networking, but success depends on product readiness and a well-prepared launch strategy.