There is no possible way they could prove anything about this in a form adequate for a short article. You either trust that the writers are responsible journalists representing the truth of the matter to the best of their ability or you don't.
That goes for the device manufacturer as well. They couldn't possibly prove the fidelity of their statements except on a witness stand under the penalty of perjury. So unless you think they are conducting the type of conspiracy that could see some of them sent to prison, we might just have to trust that they don't defraud the public on a regular basis.
I am afraid you have an unreliable source. The Constitution was ratified by the states, not signed by delegates. At the time of ratification, the average age of the delegates was 42. James Madison, for example, was born in 1751 and was 36 years of age in 1787. Alexander Hamilton was born four years later and was 31 in 1787. There were only four delegates in their twenties.
The health insurance tax subsidy for self employed individuals is not as extensive as that indirectly provided to conventionally employed persons through their employer because it does not reduce the self employment tax, which is substantial.
Whereas with statutory employees anything the employer purchases in that regard is not included in the tax base for the payroll tax or the income tax, i.e. is basically tax free. Self employed folks are treated better than they were a few years ago (no deduction basically), but that is still a big difference.
The reason why that won't happen spontaneously is that the employer purchased health insurance subsidy amounts to something like $273 billion per year (as of 2019). Employees would have to pay a comparable amount in additional income taxes to purchase comparable health insurance for themselves.
Most employers did it for decades before they were legally required to. The tax benefit to having your employer purchase your healthcare has been substantial since about World War II and such plans have been commonplace ever since, outside of unusually small employers or employees who are marginally paid.
That goes for the device manufacturer as well. They couldn't possibly prove the fidelity of their statements except on a witness stand under the penalty of perjury. So unless you think they are conducting the type of conspiracy that could see some of them sent to prison, we might just have to trust that they don't defraud the public on a regular basis.