If I'm in a relegation battle i would pick the person who hasnt been relegated before, he was a mainstay in that Burnley team. Obviously its not all on him to win games but hes playing in one of the most important places in the team in terms of goals scored against you.
Let’s say in our predicament we need a left back and the options are a young lad with little experience who hasn’t been relegated or ( sorry for this) Andy Robertson who has been relegated. You pick Robertson every time. A team’s Relegation has nothing to do with an individual’s talent.
Also,
Burnley conceded 13 less goals than us, 53 to our 66. They also had more clean sheets 9 to our 8. Burnley went down because they couldn’t score, not because they couldn’t defend. They only got beat by more than 1 goal 11 times and 7 games with a 1 goal deficit. A decent attack could turn a few of those close losses or draws in to draws or wins and then they stay up. They actually lost less games than us, 17 to our 21. Their biggest defeat was 4-0 to Chelsea in the only game they conceded 4. Us on the other hand conceded 4+ on 4 occasions.
In short, I’ve got nothing to concern me about Tarkowksi coming in and helping to plug our defence, ready for the next guy in a few years to take his place in a more stabilised side.