The box with '+++++' represent the position with expired sessions.

1st Iteration      
Removed = 0                       

  +-----+
1 |     |
  +-----+
2 |+++++|
  +-----+
3 |     |
  +-----+
4 |     |
  +-----+
5 |+++++|
  +-----+

2nd Iteration
Removed = 1
2 <- 5

  +-----+
1 |     |
  +-----+
2 |+++++|
  +-----+
3 |     |
  +-----+
4 |     |
  +-----+
5 |+++++|
  +-----+

3rd and 4th 
Removed = 1

5th Iteration
Removed = 2
5 <- 4

  +-----+
1 |     |
  +-----+
2 |+++++|
  +-----+
3 |     |
  +-----+
4 |     |
  +-----+
5 |     |
  +-----+

Then after this line:
If intRemovedEntries > 0 Then ReDim Preserve sarySessionData(3, UBound(sarySessionData, 2) - intRemovedEntries)

the array of sessions hold become like this:

  +-----+
1 |     |
  +-----+
2 |+++++|
  +-----+
3 |     |
  +-----+

Removing 1 valid session and leaving 1 invalid session.