From my reading, the Archimandrite George’s point was that the Western Church does not hold to the idea of Theosis/Sanctification, i.e, the”participation in God’s glory, a vision of God, of His Grace and His uncreated light”. This is clearly wrong.
As a student of John Wesley I suggest reading his sermon on “Christian Perfection”. Unfortunately, many people have mis-interpreted it to mean if we are just “good” enough we can be perfect in this life and thus see God. The whole point is that Perfection is a long process that after death puts us in the presence of God which is achieved thru sanctifying grace which is available to all humanity by God thru the mediation of the Holy Spirit. Hebrews 12:14(b) “..and holiness the holiness without which no one will SEE the Lord.” (My emphasis)