Goldfries, mirrorless term has been a highlight debate for a long time. To put it simple, mirrorBOX will be used as a determinator. Without a mirrorbox is consider as mirrorless. With a mirrorbox is consider non-mirrorless.

But with that information, compact camera, mobile phone camera, etc lacks of mirror, are they mirrorless? Technically, YES, but modern marketing considered only 'interchangeable lens unit' are mirrorless camera.

Sony SLT is not mirrorless. There is a mirror that reflect information into AF sensor module. Hence it's not mirrorless what-so-ever another online reviewer Opinion is. That's just an Opinion, not a statement of it's or not a mirrorless. And yes, u can have your opinion even others sees otherwise.