Again, a viewing Protestantism as a single monolith.
Oh, yes. I have always argued that there is no such thing as “Protestants believe…”.
Rather, it is a behemoth of tens of thousands of differing denominations and differing (and often contrary) doctrines.
Surprise. Different groups have different teachings.
It is curious that this has occurred when using Scripture as the authority.
Why is that?
Because without an final arbiter of what Scripture means, you get “different groups” having “different” (and often contrary

) teachings.
I like Jimmy Akin, and I don’t mean to be snarky, but the same issues apply to communions that are not typically described as protestant. PNCC, Old Catholics, OO, EO, and CC all have different viewpoints, yet claim Sacred Tradition.
The sad nature of division is that different groups have different views and beliefs.
If you read further on in the article, Akin addresses that very point.
In response, a number of points may be made: First, Catholicism has a functioning magisterium that can decide that these matters are not essential differences. Second, the relevant schools adhere to the teachings of the magisterium and, if their views were reprobated, would accept the results (or cease to be faithful Catholics). Third, the differences between Catholic schools of thought have nowhere near the magnitude of the difference among Protestant schools. Compared to the differences among Protestant groups, differences among orthodox Catholic groups are trivial. Finally, the fact that the Catholic Church has a magisterium means that there can be—and on the most important theological matters there is—an official Catholic position. There is no parallel standard in Protestant circles that can speak for Protestantism.
Other times, advocates of the “unity in essentials” argument will attempt to construct a parallel argument against Catholics by pointing to the existence of ostensible Catholics who refuse to acknowledge the magisterium’s teachings.
In response, it should be pointed out that the difference among Catholic dissidents is frequently far less than among individuals in the sweep of Protestant belief. Furthermore, individuals’ refusal to accept the magisterium’s teachings does not challenge the Christ-given authority of the magisterium any more than the refusal to accept some of Paul’s teachings undermines Paul’s authority as an apostle. Moreover, Protestant churches also have individuals who refuse to honor the teachings of their denominations. The difference is that for Catholicism there is a body—the bishops teaching in union with the pope—who “speak for the Church” and who can articulate what “the Catholic position” is, while in Protestantism there is nothing comparable.