While being somehow dated as it was introduced back in 2015, it received some midlife updates and still holds up with the current models, at least in smaller dimensions. At the right price, it could be a great choice.
275/30 R19 doesn't belong to the most popular dimensions for winter tyres - there are 0 tyre models available, which can be compared to 155/60 R15, 170/60 R17, 160/60 R14. Let's break down the sizing - 30 is height of the tyre, which is calculated as 30% of the tyre width (275mm), which means the sidewall height has 82.5 mm. The wheel diameter is R19, which means it fits to a 19 inch/482.6mm diameter wheel. The total circumference of the tyre is 2034.5 mm, which is very similar to 205/65 R15(2034.18 mm), 180/60 R17(2035.12 mm), 235/35 R19(2032.92 mm), 215/50 R17(2031.98 mm), 235/30 R20(2038.89 mm), 160/60 R18(2039.52 mm), 275/35 R18(2041.09 mm). There are multiple speed indexes available for winter tyres in 275/30 R19: V(240km/h), W(270km/h). The same goes for weight indexes: 96.