There's some information buried way down on the LTR website under application process - vis issuance, and it (partly) clarifies the point raised:-
Visa period and staying permission
According to the annoucement of the Ministry of Interior Affairs, the applicant who passed the qualifications endorsement for LTR visa (and has had the visa issued in the period within 60 days from the date of qualifications endorsement letter issuance) will receive the 10-year visa stamp from the Immigration/Thai Embassy on the date of your LTR Visa issuance. However, the immigrantion will grant the permission to stay in Thailand with unlimited accesses to the Royal Thai Kingdom (multiple re-entry) for no more than 5 years. This means that you will get a 5-year visa stamp first. And, before the expiration of your first staying permission, your qualifications and criteria will be verified again (you will be required to submit documents and proof via the system). If your qualifications and criteria do not meet the requirement e.g. for Wealthy Global Citizens catagory, if the value of your investment in Thailand is less than USD 500,000 because you sold your property, or have canceled your health insurance and did not have a proof of the health insurance for the past years* etc., in such cases, the LTR visa shall be revoked.
* Remarks:
* You are required to report to LTR Visa unit if your purpose of staying in Thailand is different to the purpose you applied for the LTR visa i.e. For LTR : W and LTR- H as staying in Thailand with an incorrect type of visa might be against the law.