The amendments made by this subtitle [subtitle E (§§ 3041–3044) of title III of Pub. L. 100–647, enacting this section and amending sections 1402 and 3121 of this title, section 71 of Title 25, Indians, and sections 409 and 411 of Title 42, The Public Health and Welfare] shall apply to all periods beginning before, on, or after the date of the enactment of this Act [Nov. 10, 1988].

Nothing in the amendments made by this subtitle shall create any inference as to the existence or non-existence or scope of any exemption from tax for income derived from fishing rights secured as of March 17, 1988, by any treaty, law, or Executive Order.”