Admittedly the man of lawlessness is not actually a type of the beast. Rather it another description of the beast, and another name for the beast.

There is a variation here between versions
and manuscripts on the name.

Some of our oldest manuscripts show the reading of man of “lawlessness” (anomias). This the preferred reading by most scholars today, and this matches with calling this organization the “mystery of lawlessness” in verse 7. The alternate reading is man of “sin” (hamartia). If we take the reading “man of lawlessness” as being correct, that means this man is characterized by lawlessness, and of course, “Sin is lawlessness,” 1Jn 3:4

A great rebellion must come first.

The Greek word is apostasia, and is actually a very strong word for a rebellion or a “defection” or desertion of one’s obligations to someone or thing. Liddell and Scott’s Greek-English Lexicon. Oxford, 1889, a lexicon of Classical Greek, lists the primary reading as “1. a defection, revolt.” It is a word for what we would call a political revolution, or an attempt to overthrow. Implied in both Revelation and 2Thessalonian 2 is that this is a world-wide phenomena that takes in “all” of the lost of this world, 2Thes 2:10-11, Rev 13:8.

In English this word apostasia has been watered down in some of the older Greek dictionaries, translations and commentaries. This word is much stronger than just “falling away,” or a “departure.” It has the idea in context of shaking your fist in the face of God. The newer dictionaries/lexicons are going back to the old Classical definition, and the watering down was never justified.

There is going to be a world-wide rebellion against God and against all law and order before the man of lawlessness comes. This has to happen BEFORE the the second coming of Christ, 2Thes 2:2-3.

This man is against the worship of ANYTHING or
ANYONE except himself.

“he who opposes and exalts himself against all that is called God or that is worshiped; so that he sits as God in the temple of God, setting himself up as God.”
2Thes 2:4 WEB

He is brought to power by a “mystery of lawlessness”
that has been working since the
first century, 2Thes 2:7.

See the previous posts about the mystery religions. So this is a multi-melenia struggle to seat this servant of Satan (Rev 13:2-3) as the true “god” of this world.

There is someone or thing who is restraining this mystery, to keep it from having success, until just the right time, 2Thes 2:6.

“even he whose coming is according to the working of Satan with all power and signs and lying wonders.”
2Thes 2:9 WEB

God also helps this man succeed, so that all
who “didn’t believe the truth but had
pleasure in unrighteousness,”
would be lost.
2The 2:12

“Because of this, God sends them a working of error, that they should believe a lie;”
2Thes 2:11 WEB

This man is destroyed by the Second
Coming of Christ.
2Thes 2:8, Rev 19:20.

WEB is the World English Bible, a copyright free revision
of the original ASV American Standard Version 1901