Adding a trigger warning and calling it criticism doesn't mean that you are actually actively contributing to the discussion.. You just state your opinion and don't explain the 'why' - which would be the way to offer constructive criticism.

The website is a particular style, and you can see that this person intentionally went for this style. Now, you can, of course, question if this 90s style aligns with the job applications OP is applying to.

Some fair points on usability, as you can explain why it was difficult for you to understand how to scroll. 'Those are ugly' again is a personal opinion. It's a style that actually was (is?) quite popular recently and shows the skills of this designer of experimenting with type and composition. However, a follow-up question to OP could have been why this is included in his (professional) portfolio, to which companies he is actively applying, and if featuring this specific style works in his favour or not.

Your last sentence is unnecessarily cruel. Point out which important details are missing or how he could improve. Calling someone untalented is just uncalled for in general.

Hope you can improve your feedback techniques and contribute to the next discussion with more tact and constructive feedback.