The Belfast Telegraph reporting on Boris Johnson's "final offer" to the EU, states that:
Mr Johnson's current plans would see Northern Ireland apply EU rules on goods, but stay in a customs territory with the UK. [...]
The DUP are the only major party in Northern Ireland supporting the proposals, with it being rejected by Sinn Fein, SDLP, Alliance, the Green Party, UUP and the TUV.
It has also been rejected by the majority of Northern Ireland's business organisations.
It does not get into any details on the latter statement. Is it correct by some quantifiable measure?