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@El_Diablo
the frame IS carbon, the key areas of bottom bracket, head tube top and bottom and seat tube top, as well as the ends are alu- so in effect its got "lugs" inside the frame and the carbon wrapped over it all.
The tubes are carbon wrap, the fairings are a car body filler material, hence the chunks chipped out and not causing any structural defect- and a frame sprayer would use car body filler to fill those areas.
For simplicity that's how carbon frames were made in the early days of small scale manufacture.
Most Giant's now are merely bonded pre made sections- you can see the join line.
BMC frames and other more recent innovations from other Co's have done away with the alu content to a large extent- even the ends are carbon now.
The frame advertised is a super strong one and well worth buying.
If the vice wouldn't ease the seat post, another method is to crush the seat post, cut the seat tube very short and use a hack saw blade down the seat post inside the frame and make eg 3-4 cuts very carefully, then use the holes left by the crushing to get a drift onto the seat post sections and knock them out, an/or use a slim chisel type of tool to ease the seat post sections away from the alu of the frame.
Always use grease before inserting stems and seat posts.......