For me it is not private
You can open link in browser and will see that this account is private 😦

do you have an api to get a video download link without the watermark from a video link ?
You can use /v1/post or /v1/post/{post_id}, download link without watermark will be available under: aweme_list[*].video.play_addr.url_list[0]

For me it is not private, also do you have an api to get a video download link without the watermark from a video link ?

It’s private account, we can’t get post from such accounts