ICA Website unclear about LTVP requirements

I've just spent two hours trawling through the ICA website regarding LTVP requirements - and particularly relating to foreign spouses of a Singaporean citizen.  The summary of what applicants require are:

First-time applicants need to apply for an LTVP with at least 10 days remaining on their Visit Pass. Visitors to Singapore must have a valid Visit Pass at all times during their stay. They must also have a passport issued only in their name.  Requirements to apply:
Foreign spouse:
•    Passport biodata page
•    Disembarkation/ Embarkation (D/E) card
•    Applicant's recent passport-sized, digital, colour photograph taken within the last three months. Please click here for photo guidelines.
•    Letter of employment, stating date of commencement, designation and monthly salary (if applicable).
For those who are self employed, a valid registration certificate from the Accounting and Corporate Regulatory Authority (ACRA) and the company's Profit and Loss Statement for the past 12 months (if applicable).
•    Payslips for the past 6 months (if applicable)
Singaporean Cit:
•    Identity Card
•    Income Tax Notice of Assessment for the past three years, and Central Provident Fund (CPF) Statement showing monthly CPF contributions for the past 12 months
•    Letter of employment, stating date of commencement, designation and monthly salary.
For those who are self-employed, a valid registration certificate from the Accounting and Corporate Regulatory Authority (ACRA) and the company’s Profit and Loss Statement for the past 12 months.
•    Payslips for the past 6 months
Both:
•    Certificate(s) showing highest level of academic qualification
•    Marriage certificate
•    Divorce certificate(s), if either or both of you have been married before
•    Letter of Long-Term Visit Pass Eligibility (LLE), if applicable.

The listed requirements of the foreign spouse assumes that they are already working in SG and have married a Singaporean.  But how about a foreign spouse who moves from a foreign country to SG to be with their SG spouse?  Are the same employment records / earnings, etc required (It talks about ACRA which is only Singaporean)?  And if the foreign spouse arrives in SG on a STVP, then how can they stay long enough for a LTVP to be processed (ICA says up to 6 months to process)?
BTW:  I asked the above question on the ICA website, but did not get a relevant answer.