Unfortunately no one can be told what Phantom Linux OS is - you have to see it for yourself.
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Ask where their numbers come from. An honest estimate is accompanied by a list of assumptions, a breakdown per feature and a best case and articles on software outsourcing a worst case.
The number in the proposal is not the full cost of ownership. Plan for infrastructure, php framework comparison paid APIs, observability and a change budget each year.
Handing a project to a vendor implies someone else is accountable for shipping: the partner staffs the roles, they manage the plan, and nearshore vs offshore development the provider carries the delivery risk.
Ask how they estimate. A credible estimate is accompanied by the assumptions behind it, hire mvp developers a breakdown by feature or module and a best case and a worst case.
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