No, they are not. They can offer low salaries because there is no shortage of pilots. If there was a shortage of pilots, they wouldn't be offering such low salaries. You cannot separate the two.
Thank you for bringing some sense into this conversation, when salaries rise without contract negotiations to attract suitable candidates, then there is a shortage....! On the mean time, the regionals are just mad that they can't get the 250 hour guys to fly for nothing to get experience.