What the manifesto says
1,500 more classroom assistants to help teachers manage behaviour and give pupils more 1:1 support.
Costing page 179 instead labels the 1,500 as teachers; unresolved source inconsistency.
The costing chapter says something else
Spend £630m on increasing classroom teachers by 1,500 and recruiting 2,000 education recovery teachers.
The costing chapter labels the 1,500 as classroom teachers. The education chapter labels them classroom assistants. This is an unresolved source inconsistency, not a delivery verdict.
Open official PDF at page 179