Not necessarily. For example, you need to be a very large company to become Tier 1. Lots of little 'boutique' manufacturers make excellent solar panels but will never be classed as Tier 1 as they don't ship enough volume.
So what's your advice on how to choose a good panel?
My simple advice is to stick to brands on my recommended chart instead of using 'tier' status to make a decision - as there are many 'tier 1' brands that I would not install on my own home!