Can you show me even ONE New Testament scripture that shows how a person can get their sins forgiven while outside of the New Covenant? No, I can't.
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But the 'holy spirit directed GB' is doing snake oil galore on that subject:
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BENEFICIARIES OF THE NEW COVENANT
Upon learning that the 144,000 are in the new covenant, some may have thought that only these benefit from it. Perhaps they thought so because only anointed ones are to partake of the emblems at the annual Memorial of Christ’s death, where the wine represents the “blood of the covenant.” (Mark 14:24) Recall, though, that those in the new covenant are to be associates with Jesus as the “seed” of Abraham, by means of which all nations will be blessed. (Gal. 3:8, 9, 29; Gen. 12:3) Somehow, through the new covenant, Jehovah will fulfill his promise to bless all mankind through Abraham’s “seed.” (...) What happens to the sins of those whom God favors? As noted earlier, Jehovah said through Jeremiah: “I shall forgive their error, and their sin I shall remember no more.” (Jer. 31:34) God does this for the anointed on the basis of Jesus’ sacrifice. In a similar way, God can forgive the sins of the great crowd on the basis of the same “blood of the covenant.” Jeremiah’s saying that God would “remember” sins no more does not imply that He would have a memory lapse and simply not be able to recall the sins. Rather, it indicates that once Jehovah has administered any needed discipline and forgiven a repentant sinner, God throws that past sin behind Him. Think of the sins King David committed involving Bath-sheba and Uriah. David received discipline and felt the consequences of his sins. (2 Sam. 11:4, 15, 27; 12:9-14; Isa. 38:17) Yet, God did not keep holding David accountable for those sins. (Read 2 Chronicles 7:17, 18.) As indicated in the new covenant, once Jehovah has forgiven sins, based on Jesus’ sacrifice, He remembers them no more.—Ezek. 18:21, 22. (...) Accordingly, the new covenant highlights a wonderful aspect of Jehovah’s dealings with sinful humans, both the anointed, who are in the covenant, and those with an earthly hope. You can trust that once Jehovah has dealt with your sins, he will not bring them up again.
Jeremiah-Book, chap. 14 pp. 175-177
http://wol.jw.org/en/wol/d/r1/lp-e/1102010153?q=%22BENEFICIARIES+OF+THE+NEW+COVENANT%22&p=par