For a combination of circumstances, I do not believe that your rate would be valid for LNF.

First, the rate of $220 is not available to the general public, see the rules (applicable areas bolded), from the Marriott website LNF rules, below.

Second, the lowest rate is now $203 (see below in red), and that rate is not LNFable, and the rules require you to reserve the lowest rate, that might make the $254 also not LNFable.

Third, taxes never have anything to do with LNF rates.

Fourth, I am by no means a LNF expert, so if I am wrong about any of the foregoing, I welcome the correct information.

FYI:

Terms & Conditions

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The guarantee does not apply to the following rate types:
Rates that are not publicly available, such as negotiated corporate or group rates.
Discount rates offered only to members of groups or individuals who meet previously-specified criteria, including AAA members, seniors, government employees, or Marriott Rewards members.
Package rates that include the room and other components such as travel, car rental, entertainment, and/or non-breakfast meals.
Package or group add-on rates that extend the length of a stay.
Rates negotiated for stays extending beyond 30 nights.
Rates that are available on auction Web sites.
Rates available on Web sites, such as Priceline and Hotwire, that do not disclose the hotel brand until the reservation is completed.
Pre-paid rates that involve a voucher or other form of pre-paid certificate (including electronic vouchers and certificates) for a hotel stay outside the United States and Canada.

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When multiple rates for the same hotel, reservation dates, and room type are available through a Marriott channel you must reserve the lowest rate to be eligible for the guarantee.

The Comparison Rate must be reservable by the general public and be verifiable by Marriott. If the Comparison Rate is offered through a Marriott channel, you must reserve that rate to qualify for the guarantee. Marriott will not charge a cancellation fee. If the Comparison Rate is reserved through a non-Marriott channel, Marriott is not responsible for any fees or other costs incurred due to cancellation of a reservation.

Rate comparison will be made net of any taxes, gratuities, or any other fees associated with the room rate, and the Comparison Rate must still be available at the time Marriott validates the claim. Rate disparities solely attributable to fluctuations and/or differences in currency exchange rates are excluded from the guarantee.

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Marriott Rewards Elite Exclusive Offer, 40 percent off Leisure Rate, membership card required, based upon availability, limited to 2 rooms per card member, see Rate Rules

203.00 USD / Night
Guest room, 1 King, Sofabed, Mountain view, Balcony