As @SamFarjamirad states it's best to consult a knowledgeable construction engineer where you live, or in your region, because such people would know the building codes & construction practices for your region. A column or pillar for a two storey house may not be necessary if the load bearing walls are designed & built properly. This may include internal load bearing wall, inside the house. The other thing to be wary of is the quality of the foundations for the load bearing walls. Also, if the house to be renovated later all load bearing walls must not be removed or altered.
It looks like the steel is being threaded through the hollow block in the external walls. This would be done to increase the flexibility of the house during earthquakes and should a typhoon/cyclone/hurricane affect the house. Internal load bearing walls should also have such steel reinforcement.
If designed and built correctly such steel reinforced walls should not collapse. They might crack during extreme natural events but they should not fall and collapse the house.
Looking at the picture you included, some things that I found strange were:
- Looking at the bricks surrounding the doorway, the bricks on the left
side of the doorway vary in width and they are not aligned vertically
very well, so there are gaps of varying sizes between the bricks and
the door frame. It would be better if the bricks were uniform in size
and vertically aligned.
- It might be the way the picture has been taken but the bricks at the
top of the window holes in the left of picture look like they may be
sagging. They should be horizontal and supported by a solid lintel.
- I'm used to seeing bricks laid in an interlocking pattern where the
bricks that are laid above one layer are slightly offset. This may
not be possible if the walls are threaded with steel reinforcing. Ask
a local engineer about this. In the picture, the bricks are laid vertically on top of one another.
- I looked at the website you provided a link to and the second picture
showed what appear to be how the roofing iron was attached to the
house. Just laying the roofing iron on the walls as shown I consider
to be a primitive form of construction.