I expect people to consider the points made in the article before dismissing it out of hand.
I consider the article to be strong evidence for Jesus being the Creator God, evidence that is not normally considered when the topic comes up.
First, I completely agree with scripture, the above not withstanding.
Second, while I see what you're trying to say, I think you're missing the point completely.
The point is that Jesus was taking the place of God when he used the phrase "I say unto you."
Regardless of which prophet said, "Thus says the Lord," they are speaking in place of God, while still attributing to God the words they are about to utter.
This is NOT the case with the phrase Jesus used, which focuses the attention on Himself, BECAUSE He is God.
And verses such as the one you just quoted make that abundantly more clear.
The verses you quoted, while yes, do "summarise the difference between the revelation in the past, and the revelation through Jesus," what it DOESN'T do is exclude Jesus from BEING God. Here's why:
God, who at various times and in various ways spoke in time past to the fathers by the prophets,has in these last days spoken to us by His Son, whom He has appointed heir of all things, through whom also He made the worlds;who being the brightness of His glory and the express image of His person, and upholding all things by the word of His power, when He had by Himself purged our sins, sat down at the right hand of the Majesty on high,having become so much better than the angels, as He has by inheritance obtained a more excellent name than they. - Hebrews 1:1-4
http://www.biblegateway.com/passage/?search=Hebrews1:1-4&version=NKJV
In other words, while in the past, God spoke through prophets to the nation of Israel (instead of speaking directly to them (which utterly terrified them)), however, God spoke through Jesus directly to them, and didn't terrify them, because He came as a man, the Man, Christ Jesus. The catch is that Jesus claimed the words He spoke as His own, and not the words of God.
The dichotomy is this:
If Jesus was not God, then simply using the words "I say unto you" is blasphemy, because Hebrews specifically states that God was speaking using Jesus, because Jesus is claiming God's authority as His own.
On the other hand, if Jesus IS God (and He is), then by Him using the phrase "I say unto you," He is rightly claiming to be God, because He takes the authority of God as His own.
The fact is that Jesus claimed to be God.
Whether you believe Him or not is on you. (John 12:48)
It teaches EXACTLY BOTH! And there is no contradiction in that!
It teaches that God the Son is speaking, and that God the Father is speaking through His Son, because what the Son says is what the Father has said.
[JESUS]For I have not spoken on My own authority; but the Father who sent Me gave Me a command, what I should say and what I should speak.And I know that His command is everlasting life. Therefore, whatever I speak, just as the Father has told Me, so I speak.”[/JESUS] - John 12:49-50
http://www.biblegateway.com/passage/?search=John12:49-50&version=NKJV
Yes it does. On that we firmly agree. But you leave out that it also teaches that Jesus is God the Son of God.