I could be wrong but I don't think the 2PL and 2BP codes can guarantee the bed type (see HGVC room descriptions below). I suggest you call the Lagoon Tower to confirm.
Based on my previous stays, I can tell you the corner two bedrooms units that I've stayed in at Lagoon Tower had two twin beds. The three bedroom penthouse rooms that I've stayed in had two double beds in one of the bedrooms and the bedroom was slightly larger.
2 Bedroom Plus (2BP)
Size 1,025 sqft Accommodates 6 guests
This spacious two-bedroom, two-bathroom ocean view suite with balcony features a master bedroom with king-size bed and bathroom with a standard shower/tub combination and TOTO washlet. The second bedroom is furnished with two twin beds or two double beds and includes a bathroom with a standard shower/tub combination The suite includes a generous living room with separate dining area, TV with cable, PlayStation 3, and queen-size sleeper sofa, as well as a full kitchen with rice steamer.
2 Bedroom Plus (2PL)
Size 1,025 sqft Accommodates 6 guests
This spacious two-bedroom, two-bathroom ocean view suite with balcony features a master bedroom with king-size bed and bathroom with a standard shower/tub combination and TOTO washlet. The second bedroom is furnished with a king-size bed or two double beds, bathroom with a standard shower/tub combination, and convenient kitchenette, and can be easily locked off from the main living area to create a relaxing element of privacy. The suite includes a generous living room with separate dining area, TV with cable, PlayStation 3, and queen-size sleeper sofa, as well as a full kitchen with rice steamer.
2 Bedroom Premier (2BX)
Size 1,025 sqft Accommodates 6 guests
This spacious two-bedroom, two-bathroom ocean front view suite with balcony, located on the 3rd - 23rd floors, features a master bedroom with king-size bed and bathroom with a standard shower/tub combination and TOTO washlet. The second bedroom is furnished with two twin beds and bathroom with a standard shower/tub combination. The suite includes a generous living room with separate dining area, TV with cable, PlayStation 3, and queen-size sleeper sofa, as well as a full kitchen with rice steamer.