In the linked article, towards the middle, the photo shows 2 people reading the plaque next to a pink structure, which appears to be that of a whale's heart. That, combined with the skeleton hanging over them, should give us an idea that we are no bigger to these whales, than probably an average snail is to us (between 5 cm and 9 cm).
This was the story that inspired Melville to write Moby Dick.
The book is both a survival story and an investigation of the Nantucket whaling industry and whaling in general, as well as the social and economic background.
https://www.atlasobscura.com/articles/found-the-worlds-tinie...
But let me just add up their lengths, along with the lengths of all giant african land snails and all other snails, and divide by the total number of snails in the world ... is there a statistical trick that could answer this, like the one for counting undiscovered species? Probably not.
Note the size of the people.
https://media-cdn.tripadvisor.com/media/photo-s/10/e1/e9/42/...
And if your rulers are bloodthirsty heart burners and skin flayers, even satan will be received warmly. I mean Huitzilopochtli is giving Kali run for her money in the deities I don't to live under competition.
And east india - you replace the elite and the people underneath will continue following orders - the same happened with the Manchu conquering of china.
Practically speaking, you can't easily just let the whales go out into the open due to the risk of someone else hunting them down vs cost of captivity or having them be 'monitored' in the wild.