It's completely pointless and the political equivalent of busy work. By this I mean it looks like politicians are doing something but they are actually achieving nothing.
Having a register
Most children are already known to the LA (as my son is) but having a register will not magically find children who aren't known. Are they going to roam the streets demanding ID from children they find? How are they going to find money for the staff and pay police to accompany staff for spot checks (unless they create new legislation to allow office staff to demand ID from the general public).
If they rely on other services such as GP, dentists etc to pass on information, it creates an issue with GDPR (HE isn't a safeguarding risk) plus it may deter parents from registering with such services.
Education targets
I would have more time for this if children in schools weren't failing but they are. Far more than are failing in HE so they should really put their focus there.
Moreover, who is going to assess this? Most LA staff involved with HE are not teachers or anything like it. Infact often have to cover 2 or 3 other roles so aren't event dedicated to HE alone. They certainly aren't routinely trained in SEND so how they'd know what a good education looked like it's anyone's guess. Most likely 'does this look like school?'
Safeguarding
The majority of referrals to social services don't come from schools (the majority are the police, hospitals etc). Yes seeing children everyday means problems can be identified however that cannot be replicated for HE. A meeting once a year or even twice isn't going to catch anything. There have been suggestions about interviewing children alone but I can't imagine many parents would be happy with their children being taken alone into a room with strangers to be questioned.
Spot checks in the home are massively intrusive. Again I can't imagine many parents would be happy with the authorities coming round at any time they like.
Though if it's deemed to be a good idea it could be rolled out to all families.
The reality is if politicians want to improve things for children they need to put massive investment into SEND in general and within schools and increase Social Services funding significantly.
But they won't because they don't actually want to improve anything they just want to look like they are doing something.