This site shows a 4.9 average rating next to its three featured quotes.
A rating figure appears with the quotes, alongside the 3-6 weeks stat and the three bundle sizes. No review platform, review count or methodology is linked.
Read it as brand-stated context rather than an audited score. Note too that the three featured quotes average 4.67, not 4.9, so the headline figure clearly draws on more than those three.