Yes, my honest impression is that left-wing people generally (i.e., it's a very popular position on the left) wanted to lower the barrier for "asylum seekers" which implies admitting lots of people without respect to their educational background or skill (hence "mass immigration"). I didn't realize this was controversial (I thought everyone agreed that this is a popular position on the left). This also isn't a value judgment--a conservative might look at that and see unintended consequences (a burden on social services, wage suppression, etc) but a progressive might look at that and see nobility ("Give me your tired, your poor, your huddled masses" etc).