It was established that they
have their own AS number; and you can check their peering arrangements
here.
But why do you care? Either they have their own multiple transit connections and peering at public peering points; or they won't, but their upstream will. According to bgp.he.net, the latter is the case. They get all their connectivity through a company called Xifos Limited.
The only practical difference is whether it is managed by their own network team, or they pay another company to handle it on their behalf. In other words, this is just an administrative boundary; one approach is not obviously "better" than the other.
Suppose that Zzoomm have a small network team without a 24x7 NOC that knows how to manage BGP; then in my opinion it's better for their transit and peering to be managed by a larger company with better out-of-hours skills.