For apprenticeships, thats good advice, keep both as employers. You can split the tax credits and standard rate cut off between both employers. In this case, better to allocate enough to offest the PAYE on the Dep Of Ed, leave the balance with the employer.
For those on apprenticeships, where effectively 2 employments are involved, it is very common to split the tax credits and standard rate cut off, just watch out for being put in a week 1 basis,where no backdate of PAYE refunds are made.
A call to revenue,
Armed with, the anticipated gross pay for 2023, for each employment, will sort this out.