Modern solid-wood furniture makes use of lighter materials too. Sometimes the backboard will be thin particle board, or certain planks will be pretty thin. Or the drawers are made of much lighter wood, possibly veneered. Also, the designs are much less ornate.
So in general, your modern solid wood furniture AND cheap, flatpack stuff will be lighter that old well-built furniture.
Modern solid-wood furniture makes use of lighter materials too. Sometimes the backboard will be thin particle board, or certain planks will be pretty thin. Or the drawers are made of much lighter wood, possibly veneered. Also, the designs are much less ornate.
So in general, your modern solid wood furniture AND cheap, flatpack stuff will be lighter that old well-built furniture.