All of this domain and DNS analysis is meaningless. They use Shopify and at this moment Whistler is dead onine. Will they return? Who knows…a fact of life, never waste time looking for a business that obviously has no intention of supporting or at least keeping in touch with their customers.
So, look elsewhere if you want products like they sold and consider them dead unless there is a miracle resurrection. Ask yourself the question even if they returned in some form, why would anyone risk a $$ with them.
My suggestion ,let them rest in peace. Enjoy their obsolete products if you own one and wish their employees luck.