You are not going to get any validation this way.

If your product is ready, I would create a landing home page, which shows a video demo or at least a screenshot of what it looks like, before I can be persuaded to sign up.

If your product is not ready, say the truth on the landing page, add some fake screenshots (how the software would look after it was ready).

I am perfectly fine with helping you validate your idea before you write any code. In fact, I would suggest everyone do that. But not this way - just a simple login / create account form makes me think that this is just a scammy way of lead generation for you.