I like that man, have seen his other videos. Biblical? In what way? In preaching? yes, Jesus told us to "go". That was the last thing he said to us, that we as Christians must go unto the world and preach the gospel! So in the sense he is very much doing the will of Jesus and the Bible. What he says it pretty spot on too, or so I think (didn't watch this exact video because sound isn't working... but I have seen others and they are all the same).
The best way to evangelize? Read the Bible. Know the Bible. Get an apologetic study Bible. Study it. Read it a few more times!
But in all seriousness, just speaking about the greatness of our Lord! If you have the Holy Spirit than you are well on the way to being a good preacher of the Bible. There is more to going about it though. Soap box'ing is good, but you must really believe and you cannot just speak about half the truth. If you preach sin you need to preach forgiveness. It isn't a one-way street.
It's a tough thing to do, I try. You will be ridiculed by atheists and "Christians" alike.
Start off with friends. Get them going to church (if they don't). Move on from there, but it takes a lot of spunk to get up on a box next to a beach and preach!