Again, this is a relatively small change in wording, but it's meant to organize the idea a little bit more clearly. It says:
give priority to ensuring the availability of secure, adequate, accessible and affordable housing to those without housing and to members of groups particularly vulnerable to homelessness, including
The point there is that it could be read previously that people who had suffered from lack of housing but had obtained it could still be somewhere favoured in the queue. So really all this does is gather that together and say no, just to be very clear, we mean if they are from these groups but also do not have good housing now. It's putting the semantics in line with the original intent of the bill.