It is not...The article posted is based entirely on that untruth which invalidates the entire thing...
ἱερεύς
hiereus
hee-er-yooce'
From G2413; a priest (literally or figuratively): - (high) priest.
Thank you for your opinion.
As you point out, there IS a word for priest in Greek - and it is NOT “presbuteros”. The Greek word for priest is never applied to a christian apart from Jesus Christ himself.
presbuteros was: “a term of rank or office
among the Jews: members of the great council or Sanhedrin (because in early times the rulers of the people, judges, etc., were selected from elderly men)
of those who in separate cities managed public affairs and administered justice
among the Christians: those who presided over the assemblies (or churches) The NT uses the term bishop, elders, and presbyters interchangeably”
http://www.biblestudytools.com/lexicons/greek/nas/presbuteros.html
Paul referenced christians making sacrifices:
I appeal to you therefore, brothers, by the mercies of God, to present your bodies as a living sacrifice, holy and acceptable to God, which is your spiritual worship. - Rom 12.1
I have received full payment, and more. I am well supplied, having received from Epaphroditus the gifts you sent, a fragrant offering, a sacrifice acceptable and pleasing to God. - Phl 4:18
In the general epistles:
15 Through him then let us continually offer up a sacrifice of praise to God, that is, the fruit of lips that acknowledge his name. 16 Do not neglect to do good and to share what you have, for such sacrifices are pleasing to God. - Heb 13.15
Indeed, Hebrews 13 is arguably all about the sort of sacrifices we are to offer as Christians!
That is pretty much it. We have no priests but Christ, because there is no other sacrifice than Christ - and He has already offered Himself:
“But as it is, he has appeared once for all at the end of the ages to put away sin by the sacrifice of himself...But when Christ had offered for all time a single sacrifice for sins, he sat down at the right hand of God...” - Hebrews
What is a “presbuteros”?
“Again and again, reference is made to a plurality of elders in each of the various churches. In fact, every place in the New Testament where the term presbuteros (“elder”) is used it is plural, except where the apostle John uses it of himself in 2 and 3 John and where Peter uses it of himself in 1 Peter 5:1...
...The primary responsibility of an elder is to serve as a manager and caretaker of the church (1 Tim. 3:5). That involves a number of specific duties. As spiritual overseers of the flock, elders are to determine church policy (Acts 15:22); oversee the church (Acts 20:28); ordain others (1 Tim. 4:4); rule, teach, and preach (1 Tim. 5:17; cf. 1 Thess. 5:12; 1 Tim. 3:2); exhort and refute (Titus 1:9); and act as shepherds, setting an example for all (1 Pet. 5:1-3). Those responsibilities put elders at the core of the New Testament church’s work. “
http://www.gty.org/resources/Questions/QA203/Why-Elder-Rule