At least the "expert" was still using over the age of two as her cut off. If a mother gets to age two (and for various reasons, I haven't, yet!), she's probably learnt from her own experience that nursing is more than just food.
To say in the instance of feeding after a child has hurt themselves is no different to giving them a can of coke is loony, but at least it wasn't a comparison to all breastfeeding after age 2, just in a comfort setting. But in a comfort setting, nursing toddlers don't usually eat very much, just because daddy can comfort them without doesn't mean mummy can, the fact they are there makes a difference!
Even the expert who considered it "bad" still said it was private, which implies choice, not that it shouldn't be done, though that came before her stronger negative statements about it.
Being a Brit and having had 2 kids in the UK and lived in the US for 3.5 yrs now and having a kid here. I found in the UK that extended breastfeeding was no big deal, in my area, it was a low income community with low breastfeeding rates, but also a few mums breastfeeding beyond age 1 or 2, I never heard a bad word said against any of them, even mums who were strongly adamanant that breastfeeding was not for them and not something they were even going to try never had anything negative to say, they just didn't say anything at all.
Here, it seems everyone has something to say, when we moved here I was nursing a 16mth old, she weaned shortly afterwards against my desires, but very few people knew I was doing that then or now, I'm currently nursing an 8mth old, so no where near the realm of extended breastfeeding, but it seems like it comes up an awful lot, without me even mentioning I'm intending to do it, more that it comes up and people are then surprised if I pipe up that I nursed beyond a year. I feel like I need LLL a lot more here, wouldn't survive without it. I knew a couple of leaders in the UK, but never went to a meeting.