It depends on your situation. If your child is already there and they are clearly able to meet needs once the statement is in place they shouldn't have grounds for not agreeing to be named. I would say it's probably worth having a very frank discussion with the Head to try and ascertain the lie of the land.
However, lots of academies are currently refusing to take statemented children, my ds included and citing the only thing they are allowed - which is that educating the child with a statement would be detrimental to the education of other pupils. This is blatantly not true in 99.99% of cases, but they are getting away with it nonetheless, partially because a lot of parents, like us, refuse to then fight to send their dc to a school that plainly doesn't want them and will probably therefore do it's darndest to make sure they aren't properly supported - ending in disaster - as in either a breakdown for the child or exclusion and also because many of those that do want to fight simply don't have the ability/means/ability.
The academy that refused my ds - who incidentially doesn't need 1:1, just extra pastoral support to help manage his anxiety, use of a laptop and social skills sessions - refused every single child with a statement for this year's intake and pretty much got away with it. They refused ds, despite assuring us only a couple of months beforehand that they were confident they could meet his needs.
Ds does well academically as well, so it's not his academic ability that was in question and there are similar pupils to him already at the school who are doing ok, so it's all about funding and being able to spend their SEN budget on yet more whole school improvements, rather than on actual SEN pupils.
For us the end result was a positive one, as by refusing to take ds, the academy effectively rendered him unsuitable for all the ms secondaries in our area, as they are all of similar size and set up. We therefore went for an out of area independent with a specialist interest in - and excellent reputation for - supporting pupils with ASD and the LEA funded it without a fight. Sadly I fear the ending will not be so happy for many of the other pupils who were refused a place, as the majority will be forced to attend the only suitable-ish school that is no longer an academy and has effectively become a sink school for pupils with both SEN and behavioural problems. 