The earlier point about rods for backs may have been made in a rather clumsy and negative fashion, but it does contain an obvious truism. A child’s transition into childcare is likely to be much easier if the parents have planned and made some adjustments in order to make it less of a shock. This is borne out by the experience of many parents and childcare providers. It is not anti-bf or parent-bashing to recognise the truth.
I don’t say this as criticism. The best way forward is to first accept the reality of the situation for what it is. It’s essential the OP grasps the need to manage expectations, because baby might struggle to adjust at first, rather more than a child who is better prepared for the transition.
Also, beware of nursery staff who respond to every question with, "oh, he's been fine." Childcare training can, at times, over-emphasise the need to 'be positive' and 'put parents at their ease'. Personally, I prefer realistic honesty over false positivity every time.
As previous posts have said, there are plenty of ways to help settle the child and I’m quite sure the nursery staff will be sensitive to his situation. But don’t let anyone kid you into believing they have some 'magic settling wand' they can wave.
It will be easier all round if you accept from the outset that it may involve a little more time and upset than is usual. If you understand that, you should find it easier to give it the patience it requires, and avoid making the common mistake of making rash decisions to switch nursery if he doesn’t settle straight away.