office-toolbox validate shows wrong output for manifest file including requirement set of Excel API version 1.9

[zakhan4]

I added a requirement set of ExcelAPI 1.9 to my manifest file. Based on https://docs.microsoft.com/en-us/office/dev/add-ins/overview/office-add-in-availability, this version is only supported on 'Office on the web', 'Office on Windows (connected to Office 365 subscription)' and 'Office on Mac (connected to Office 365 subscription)'.

But when I validate my manifest file. The output I received is this:

Validation: Passed
Based on the requirements specified in your manifest, your add-in can run on the following platforms; your add-in will be tested on these platforms when you submit it to the Office Store:
  - Excel 2016 for Mac
  - Excel 2016 or later
  - Excel Online
Important: This analysis is based on the requirements specified in your manifest and does not account for any runtime JavaScript calls within your add-in. For information about which API sets and features are supported on each platform, see Office Add-in host and platform availability. (https://dev.office.com/add-in-availability).

With Excel API 1.9, do you think it will still work in Excel 2016 and 2019 standalone purchases?