A SIM only plan has no bundled network of its own; it runs on someone elses. The TPG Mobile Critical Information Summary names that someone: the underlying network is the Vodafone mobile digital network 4G.
What the naming tells you
The summary specifies 4G, which is the generation of the underlying network rather than a marketing speed class. It does not describe a 5G entitlement on this plan, and we do not publish one, because none is stated in the source. Anyone telling you this plan gives 5G is going beyond what the provider publishes.
Why the underlying network matters more than the retailer
Coverage comes from the network, not the brand you buy from. TPG Mobile SIM only being Vodafone 4G means the coverage you get is the Vodafone 4G coverage map, and any area not covered by that map is not covered by this plan regardless of how good TPG service is elsewhere.
The check to make before you buy
Take the addresses that matter to you and look them up on the Vodafone coverage map before you commit. This site does not promise coverage at any address and will not attempt to guess it, because a coverage guess is worse than no answer. The published advice from the other side of the market is the same: check the provider coverage map to see what is predicted where you intend to use the service.
Coverage. No provider promises coverage street by street, and neither do we. Check the provider coverage map for the addresses you actually care about before you commit to a plan.