Does it means that even if i buy VMS16 Platinum version I can't start DVD architect standalone ? Can anyone please confirm ? I do not want to buy this as according to Magix return policy downloaded products are not eligible for return.

Not sure at all what you are asking. DVD Architect is a separate program. Always has been.

It is included in a BUNDLE with some Vegas versions, but not with others!

You can have more than one version of DVD Architect on your machine at one time. Same with Vegas. I have three versions of Vegas and two versions of architect. They all work.

This has absolutely nothing to Do with burn- from-timeline, which is a standard feature of several Vegas versions. DVD Architect can also be purchased separately, if you will but avail yourself of the Magix Vegas pages, this all will become abundantly clear to you. Best.

https://www.magix.com/us/support/welcome-to-magix/

@pat_ultimate wrote

according to Magix return policy downloaded products are not eligible for return

See https://www.vegascreativesoftware.info/us/support/article/revoke-order-return-right-of-withdrawal--1515/

You have the right to cancel your MAGIX/VEGAS order within fourteen days without stating a reason.
The withdrawal period is fourteen days starting on the date on which you or a designated third party who is not the carrier, has taken possession of the goods
For the delivery of digital content, it starts with the conclusion of the contract.

For fast and easy processing, please send your cancellation as a response email to your order confirmation.

Please note that the right of withdrawal is valid exclusively for consumers. The buyer bears the return shipping costs.

You will find the complete cancellation policy in our General Terms¹.

¹) See §3 B. here https://www.magix.com/int/terms-and-conditions/

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Blu-ray and DVD Disc™ Authoring software = VEGAS DVD Architect (Version Comparison table)

You do not need to buy VEGAS DVD Architect separately if you have a VMS Platinum or Suite (or a VEGAS Pro. VP Edit version does not come with DVD A) as @Musicvid noted. You can use DVD A as a standalone as well.