I actually think the yield is concerning. For fun, you can plug in your own assumptions to this calculator [0], but with assumptions below, the yield on bonds due 2028 implies a 20% chance of default.
Market price is 0.7/face value of 1/coupon of 3.375 (from the article), payments per year = 1 with 7 payments remaining (you could also do 6, depends on whether they've made a payment this year which I didn't bother looking up), recovery rate of 60% (assumption, the model is really sensitive to this input), and the 5 year treasury rate is around 2.97 percent which I used as the risk free rate.