I thank you so much for your kindly clarifications.
If you still have the control over that old btc address(i mean if you own the private key), you can still claim your bch and bsv. (Like i said only if you had any funds before 2017 August)
That's what I known, but recent days, I noticed that
https://www.blockchain.com/explorer redesigned their user interface.
When I type BTC address, I can check both BTC and BCH transactions.
That's why I asked the question, even I don't think that I have any chance to claim those coins.
As you said, I think it's better if blockchain.info should make adjustments for their site to avoid misunderstandings; especially for noobs in crypto.
Edited:
Sorry, I visited minutes ago to check. In fact, I missed something seriously.
The site redesigned recently, that I did not know.
So, what I asked is for the redesign round, before the latest one. Sorry. Close the question for now.