I have qualifications in physics EOM...... now again, the WOO you pooped in your OP had nothing to do with the temporal dimension in the video you posted.
The 3D universe is moving along the axis, the direction of time, reffered to sometimes as the 4th dimension. This is just terminology, as your video said, just a "label". Your video clearly says THIS DIMENSION IS NOT SPATIAL. You say you are a physics forum visitor ..... ahem.... so do explain how these spirits exist in a non spatial, temporal - direction. The 4th dimension is a direction, a right angle to the previous three.... That is all. IT IS NOT a gap, for you to throw a pile of woo into and say 'tada spirits exist!'
This is your claim, having learned that other dimensions exist (high school science)...."Anyway it's interesting that if there are living beings in these higher dimensions, they would take on the characteristics of spirits to us.and this is based on science, there are higher dimensions, that is absolutely known, but the question is about life on higher dimensions."
Firstly what is this 'higher' dimension? Where did you see a reference to 'higher' in any scientific source? You are implying a higher realm, a religious zone. This is both ignorant, unjustified and decietful. You then say there are higher dimensions, as in plural and this is absoloutly known. Your physics knowledge is lost in woo. We have used quantum physic, string theory and a lot of math to say there is likely at least 11 dimensions. We have not even the means to comprehend these 'theories' and here you are stating 'sprit' life forms inabit them and that we can see them. Your ignorance knows no bounds. Do yourself a favour, buy some bullshit insurance.... get a library card.
Also, wheneever you evoke science with fantastical claims, please provide a source. Show us the papers and journals. Physics forums and youtube videos don't count.... Unless it is Carl Sagan of course :D